fifish

时间:2024-07-28 05:53:23编辑:流行君

无人机品牌排行榜前十名是什么?

DJI 大疆创新致力于持续推动人类进步,自 2006 年成立以来,在无人机、手持影像、机器人教育及更多前沿创新领域不断革新技术产品与解决方案,重塑人们的生产和生活方式。DJI 大疆创新与全球合作伙伴携手开拓空间智能时代,让科技之美超越想象。
大疆创新致力于成为持续推动人类进步的科技公司,以“做空间智能时代的开拓者,让科技之美超越想象”为使命,坚持“激极尽志、品诚求真、乐享谦学”的价值观。

对于技术与产品,大疆创新坚持以梦想为源动力,乐于创造、勇于实践,做有实干精神的梦想家。我们相信,卓越的成果,有赖于实践过程中对梦想极致而不妥协的追求;
对于未来发展,大疆创新坚持以敬畏未知的态度不断自我反思,在保持自我提升的同时,带动组织的持续进步与升级。我们相信,没有反思和进步的人生不值得一过;
此外,大疆创新也积极与广大消费者、合作伙伴连结成为进步道路上的命运共同体。我们坚持为优秀喝彩、因合作而卓越,以正念、坦诚的态度,建设开放、合作、共赢、可持续的技术生态,与客户、伙伴携手推动产业健康良性的发展。


无人机哪个牌子好

无人机好的牌子有:1、大疆创新大疆创新是成立于2006年的深圳市大疆创新科技有限公司旗下的专业无人机品牌。大疆主要以研发生产各种无人机为主营业务,致力于为广大消费者提供专业性能最强、体验感最好的产品。2、派诺特派诺特是于1994年在法国成立的最早开始制造无人机的品牌,主要以研发生产各种民用无人机为主营业务,旗下产品线比较丰富。3、一电科技一电科技是成立于1999年的深圳一电科技有限公司旗下品牌,主要以研发专业的无人机系统和高端智能系统为主营业务,旗下无人机产品线比较丰富,各个领域都覆盖。4、零度智控零度智控是成立于2009年的零度智控智能科技有限公司旗下品牌,主要以研发生产各种小型无人机为主营业务,与国内知名的研究所和大学都有合作,致力于为消费者带来专业、安全的产品。5、Ehang亿航亿航是成立于2016年的无人机十大著名品牌之一,其创始人来自国际知名大学,在飞行器领域有着多年的研发经验。亿航无人机拥有自主的操控系统,凭借着高品质,在市场上也有很高的占有率。6、Yuneec昊翔昊翔是成立于2006年的昊翔电能运动科技有限公司旗下品牌,主要以研发生产各种飞行器械为主营业务。虽然昊翔品牌成立时间不长,但发展迅速,昊翔无人机系列比较丰富,以亲民的售价在市场上也有不错的消费口碑。

产品动画应用于哪些领域?

产品动画可应用于诸多领域:机械行业,如汽车、航海、航空、机床及零部件、发动机三维动画等; 电子行业,如家电通讯、医疗设备、监测仪器仪表、安防设备、娱乐电子产品动画等。还可以应用于科研领域,如航空航天、地球物理、钻探、核能应用、军事装备三维动画等; 生产流程演示,如产品生产流程、生产工艺、工业品流水线等三维动画……如今,在很多领域都能看到产品动画的应用。扩展资料产品动画能把产品的结构、特点、功能、工作原理、使用方法、注意事项等通过三维动画形式立体呈现出来,使人们直观、详实、全方位动态了解产品功能及特色。产品动画已广泛运用于企业的产品研发、测试、宣传、展示等,成为公司网站、行业展会、业务员手头的最佳展示工具(宣传片、多媒体互动光盘、网上虚拟演示等)。

无人机十大名牌排行榜

无人机十大品牌排行榜:1、大疆创新大疆创新成立于2006年,是深圳市大疆创新科技有限公司旗下的专业无人机品牌,也是中国科技十大巨头之一,大疆主要以研发生产各种无人机为主营业务,致力于为广大消费者提供专业性能最强、体验感最好的产品。2、派诺特派诺特于1994年在法国成立,是最早开始制造无人机的品牌,主要以研发生产各种民用无人机为主营业务,旗下产品线比较丰富。3、一电科技一电科技成立于1999年,是深圳一电科技有限公司旗下品牌,也是无人机十大品牌之一,主要以研发专业的无人机系统和高端智能系统为主营业务,旗下无人机产品线比较丰富,各个领域都覆盖。4、零度智控零度智控成立于2009年,是零度智控智能科技有限公司旗下品牌,主要以研发生产各种小型无人机为主营业务,与国内知名的研究所和大学都有合作,致力于为消费者带来专业、安全的产品。5、Ehang亿航亿航成立于2016年,其创始人来自国际知名大学,在飞行器领域有着多年的研发经验。亿航无人机拥有自主的操控系统,凭借着高品质,在市场上也有很高的占有率。6、Yuneec昊翔昊翔成立于2006年,是昊翔电能运动科技有限公司旗下品牌,主要以研发生产各种飞行器械为主营业务,虽然品牌成立时间不长,但发展迅速,昊翔无人机系列比较丰富,以亲民的售价在市场上也有不错的消费口碑。7、ChinaRS中科遥感中科遥感成立于2016年,是中科遥感科技集团有限公司旗下品牌,主要以研发生产各种无人机为主营业务,拥有自主的生产研发基地,发展至今,也获得了国家高新技术企业的称号。8、易瓦特易瓦特成立于2010年,是易瓦特科技股份公司旗下品牌,也是国内领先的民用无人机生产企业之一,拥有大规模的研发生产基地,发展至今,旗下的产品已经运用到多个领域。9、极飞极飞成立于2007年,是广州极飞电子科技有限公司旗下品牌,主要以研发无人机和无人机控制系统为主营业务,不仅获得多项国家、国际专利技术,而且产品还远销全球多个国家和地区。10、臻迪臻迪成立于2012年,是北京臻迪科技股份有限公司旗下品牌,主要以研发生产各种智能产品为主营业务,与国际知名的专业机构合作,旗下无人机不仅在国内市场很受欢迎,而且还远销芬兰、美国、日本等国家和地区。

无人机品牌排行榜前十名

公司简介深圳市大疆创新科技有限公司成立于 2006 年,如今已发展成为空间智能时代的技术、影像和教育方案引领者。成立以来,大疆创新的业务从无人机系统拓展至多元化产品体系,在无人机、手持影像系统、机器人教育、智能驾驶等多个领域成为全球领先的品牌,以一流的技术产品重新定义了“中国制造”的内涵,并在更多前沿领域不断革新产品与解决方案。我们以创新为本,以人才及合作伙伴为根基,思考客户需求并解决问题,得到了全球市场的尊重和肯定。目前,大疆全球员工达14000人,除深圳总部外,在北京、上海、西安、香港、东京、洛杉矶、旧金山、鹿特丹、法兰克福等地设有办公室,支撑着全球一百多个国家和地区的销售与服务网络。文化理念大疆创新致力于成为持续推动人类文明进步的科技公司。我们以“做空间智能时代的开拓者,让科技之美超越想象”为使命,致力于通过领先的产品与技术能力,与客户、伙伴携手推动产业健康良性发展,让未来的智能机器人心明眼亮有智慧,覆盖与人类活动紧密关联的整个空间,让人们的工作和生活更美好。社会贡献为世界带来全新视角大疆创新经过六年积累,于 2012 年开创民用无人机行业,带来了划时代的无人机系统与影像解决方案;其面向大众消费者的手持影像系统,与专业云台相机系统、摄像增稳系统,不断刷新消费级与专业级的视频创作体验,开启了全球“天地一体”的影像新时代。重塑人们的生产和生活方式大疆创新为用户带来创新、可靠的产品,并迅速进入影视传媒、能源巡检、遥感测绘、农业服务、基建工程、前沿应用等多个领域,为各行各业提供了高效、安全、智能的工具。同时,我们致力于成为公共安全和应急救援中不可或缺的中坚力量,在地震、火灾、危化物品泄露、爆炸、突发疫情中提供强有力支持。培养社会的科技创新力量大疆创新持续深耕机器人教育领域,致力于为社会培养复合型科研人才。大疆创新发起并承办了 RoboMaster 机甲大师赛,推出了教育机器人产品,受到全球科技爱好者的追捧,并与众多国内外学校、研究机构密切合作,搭建出一套由课程、产品、赛事及相关服务构成的全栈式机器人教育解决方案。我们正与全社会一道拓展教育新边界,成就新一代技术人才。我们坚信,人是科技发展的目的,而非工具。我们秉持“秉持公心、求真品诚、激极尽志、反思自省、积极正向、知行合一”的价值观,鼓励每一个人在做事的过程中发现自我、磨砺自我、收获成长。通过创造最好的高科技产品,大疆创新将不断培养和成就德才兼备的人才,为志同道合的伙伴们打造实现梦想、超越自我的精神家园,为推动人类文明的进步贡献力量。

生活委员的职责是什么

生活委员职责:1.贯彻学校在生活管理工作中的各项意见和措施。2.定期召开舍长会议,搞好寝室的纪律和卫生以及同学的身体健康。3. 关心同学的日常生活,在易发病时节积极做好预防提醒。4. 保管和使用班费,定期向班委会和全班同学做好班费使用情况公示。5. 关心同学们的饮食健康,不定期提醒同学们注意保持合理饮食。6. 负责设施报修,领取教学劳动用品等。扩展资料:生活委员的日常:1.协助班主任保管和使用班费。2.在新生入学时,要购买布置教室的材料,购买材料时要预先写好需要的东西,然后与卖家讲价格,索要购物凭证。3.整理好账目,使账目清晰,准确。每隔一段时间向班级同学公布经费的使用方向,便于民主监督。4.在每次使用班费前要征求同学的意见,是否能使用班费。5.关心同学的日常生活,在易发病时节(如春,秋两季)积极做好预防措施,比如在班级内泼洒消毒水等。参考资料:百度百科-生活委员

怎么看水下无人机的有缆问题?

1.下潜深度仅30米。这是第一个硬伤,楼上居然有人说这已经算深海范围了,excuse me?黑人问号脸。30米以下才算深海好吗?如果仅是这种深度的探鱼器,TB一搜一大把,价格几百元到四五千元不等。仅从30米深度而言,没有竞争优势。说起来,水下机器人的下潜深度越深,对于机身性能(如抗压能力,运行稳定性等)都有不少要求,别告诉我说国内无人机厂商做不到 Submersible Underwater Drone 看看这款水下机器人,同样是国内(中国深圳)厂商,却能做到深度下潜100米。孰优孰劣,自见分晓。2.探鱼器犹如鸡肋钓鱼领域,根据钓鱼地点大致划分为湖钓,海钓,塘钓……当然根据不同的钓法也有划分,如路亚,矶钓等,在此不展开赘述。至于这款小海鳐的诱鱼器能捉到鱼?小鱼小虾我倒信,但是估计臻迪的市场部是没见过真的海钓者的渔获吧?随手在相关论坛扒几张图你们感受一下。

烤鱼用英语怎么说?

问题一:烤鱼英文怎么写 roast fish

问题二:吃烤鱼吗 用英语怎么说 Wuld you like some grilled (炭烤)/roasted(烤箱烤) fish?

问题三:烤鱼的英文 烤鱼
1 grill
2 roast fish

问题四:一起吃烤鱼英语怎么 翻译:
1) Let's go to have toasted fish
2) Let's have barbecued fish together.
烤鱼也分几种:
烘箱烤的: grilled fish.
烧烤型的:barbecued fish.
火炉烤的: toasted fish.

问题五:(这烤鱼吃起来肯定真很爽)英语翻译怎么说? 翻译? this grilled fish eat affirmation is good

问题六:问一下谁知道2005河北分数线 还没有出来呢。不过可以参考sohu的高考版(首页有链接)里面有很多估分

问题七:我们吃了美味的烤鱼在海洋餐厅,英语翻译怎么说要用从句谢谢 We had delicious grilled fish, which was served at the Sea Restaurant.
:D 最佳最准答案无疑。

问题八:美食用英语怎么说? delicious food

问题九:爸爸在洗澡时,我在吃烤鱼用英语怎么说 When my father is taking a bath, I am eating roasted fish.
While my father is having a bath, I am enjoying roasted fish.

问题十:烤鱼英文怎么写 roast fish


烤鱼英语怎么说

问题一:烤鱼英文怎么写 roast fish

问题二:吃烤鱼吗 用英语怎么说 W?uld you like some grilled (炭烤)/roasted(烤箱烤) fish?

问题三:一起吃烤鱼英语怎么 翻译:
1) Let's go to have toasted fish
2) Let's have barbecued fish together.
烤鱼也分几种:
烘箱烤的: grilled fish.
烧烤型的:barbecued fish.
火炉烤的: toasted fish.

问题四:烤鱼的英文 烤鱼
1 grill
2 roast fish

问题五:(这烤鱼吃起来肯定真很爽)英语翻译怎么说? 翻译? this grilled fish eat affirmation is good

问题六:问一下谁知道2005河北分数线 还没有出来呢。不过可以参考sohu的高考版(首页有链接)里面有很多估分

问题七:我们吃了美味的烤鱼在海洋餐厅,英语翻译怎么说要用从句谢谢 We had delicious grilled fish, which was served at the Sea Restaurant.
:D 最佳最准答案无疑。

问题八:美食用英语怎么说? delicious food

问题九:“定食”英文怎么说?比如烤鱼定食?谢谢! 反正再悉尼的日本料理,“定食”就翻译成 meal
烤鱼定食没吃过,估计大多会被翻译成 grilled fish meal , roast fish meal或者 BBQ fish meal


英文作业 求答案

31 Do you have any fresh fish today?( C ) a. No, I still have a little. b. Yes, I have many. c. Yes, I have some. d. No, I still have a few. 32 Can you go to the concert with us this evening? ( B ) a. No, I really don't like being with you b. I'd love to, but I'm busy tonight c. No, I already have plans d. I'm ill, so I shouldn't go out 33 Could you help me with my physics, please? ( B ) a. No, no way b. Sorry I can't. I have to go to a meeting right now c. No, I can't d. No, I couldn't 34 Can I help you, sir? ( A ) a. Yes. I'd like to withdraw some money. b. Don't bother me! c. No, I don't need your help. d. Well, leave me alone. 35 Can you help me? ( A ) a. Sure. What is it? b. Don't mention it. c. No, I don't know. d. That's it. 36 Do you like my new jacket? ( A ). It goes beautifully with your hat. a. Yes, I like it very much b. Yes, but it doesn’t suit you c. Yes, and I like your hat d. I’m not sure 37 Could you be so kind as to turn down that rock "n" roll? I'm preparing for tomorrow's exam. ( C ) a. No, I don't think so. b. It's none of your business. c. Sure. Sorry to disturb you. d. What are you doing? 38 Can I have a look at your passport?( D ) a. Here is it b. No, you can’t c. It is here d. Here you are 39 Can I help with your luggage? ( C ) a. No, you needn't. b. No, not necessary. c. No, thanks. I can manage it. d. No, why? I can do. 40 Could you say it again, please? ( A ) a. Certainly b. Yes, you are welcome c. Yes, I am glad about it d. That's nothing 请采纳


初二英语单选题目

刚才给回答了一遍 还给我难住了
2 Could I take a message _____ him? A from B to C for D with
3 There is _____water in the glass, isn‘t there? A a few B few C little D a little
4 They are _____the cinema now. A at B in C on D to
5 We can see it______. A enough clear B enough clearly C clear enough D clearly enough
6 There are many apples _______the tree. A in B on C at D with
7 I enjoy ______ books. A looking B to look C reading D to read 8 Thank you for______ me. A tell B telling C to tell D told 9 I’m afraid ______ the dog. A of B to C for D at 10 --Thank you very much. --That‘s my _______ A happy B glad C pleasure D nice 12 Could you ask her_____ me? A to write B to write to C writing to me D write to
13 Hi, there’s a telephone call ________ you . A to B for C on D with
14 Picking apples is not _______ easy work. A on B a C / D one
15 Lucy’s phone number is 5-6-3-2-6-4,please.__on a piece of paper. A write down them B write them down C write it down D write down it
16 the days get _______ in summer A longer B shorter C colder D cooler
17 she is from shanghai, ______? A is she B isn’t she C does she D doesn‘t she
18 It’s _______ to wear warm clothes in winter. A well B bad C best D worse
19 we really enjoyed ______ with the farmers. A to word B work C working D worded
20 please _____ your coat. It‘s cold outside. A .wear B wearing C putting on D put on
21 she often helps me _____ my English. A study B studying C at D for
22 There are a lot of people in the park, ______? A are there B aren’t there C are they D aren‘t they
23 It’s not very hot in autumn, _______? A is it B isn‘t it C is not it D ate they
24 In china there are _______ seasons in a year. A there B fonr C twelne D two
25_____ the weather like today? A what’s B how‘s C whose D which is
26.I would like you _________ with me. A.play B.will play C.to play D.playing 27.There were _______friends of mine in the room. So I left. A.few B.a few C.little D.a little
28.She’ll go with you if it _____ tomorrow. A.doesn‘t rain B.won’t rain C.isn‘t rain D.will rain
29.He broke the window _____ time A.the third B.third C.the three D.a third
30.This week we’re going to have ______to do. A.many mork B.many works C.a lot of work D.a lot of works
31.Betty asked me to ______ my new pen here next time A.take B.bring C.carry D.borrow
32.Nobody in our class ______ to go to the cinema A.think B.thinks C.want D.wants
33.Mary is ______. She writes most ______ in our class. A.careful, careful B.carefully,careful C.carefully, carefull D.careful,carefully
34.I have to look after him, _________ I? A.haven’t B.don‘t C.needn’t D.mustn‘t
35.It took ______ two hours _____ her homework yesterday. A.she, to finish B.her, finishing C.her, finish D.her, tofinish
36.Help yourself to some fish! A.Thank you B.That’s good C.Certainly D.All right.
37.Ask the old man, he ______ know something about it. A.can B.may C.maybe D.needs
38.— ________. I’m late. —It doesn’t matter. A. Hello B. Sorry C. Excuse me
39.Look! That girl ________ now. A.is shoping B.are shopping C. is shopping
40.Peter is late ________.Please ________next time. A.this time...on time B. this time...be on time C.next time...on time 41.Mary ________ to school at 7:30 every morning. A. goes B. went C. going
42.—Why not ________ English? —That’s a good idea. A. speak B. to speak C. speaking
43.You’d better ________ your bedroom. A. to clean B. cleaning up C. clean up
44.—Children enjoy ________ games. —I think so. A. play B. plays C. playing
45.How many ________ are there in the hall? A. students B. student C. teacher
46 There ________ two pens and a ruler on the desk. A. are B. is C. have
47.Mr. Green can ________ Chinese very ________. A. speak...good B. speak...well C. talk...well
48.His parents told him not ________. A. be late B. to late C. to be late
49.You must ________ back tomorrow afternoon. A. come B. going to come C. comes
50.My sister makes me ________ my room on Saturdays, A. to clean B. clean C. cleaning
51.Thank you for ________ me. A. helps B. to help me C. helping
52.It ________ me two hours ________ the computer. A.use, mend B use, to mend C. takes, to mend
53.________ are you going to do this afternoon? A. where B. what C. when
54. He knows little about Canada, ________ he? A. doesn’t B. does C. don’t
55.Welcome back home. — ________. A. Thank you B. Hello C. Excuse me
56. —Must I do it right now? —No, you . A. won’t B. mustn’t C. don’t have to D. don’t
57. Why not to the cinema with us? A. to go B. going C. go D. goes 58. The baby stopped and the music. A. crying, listened to B. to cry, listened to C. crying, to listen to D. to cry, listen to
59. It us three hours to do the work yesterday. A. takes B. take C. will take D. took
60. cold weather it is today! A. How B. How a C. What a D. What
61. Eating is not good for your health. A. too many B. too much C. very much D. enough
62. We are going out for a picnic if it tomorrow. A. not rain B. isn’t rain C. rains D. doesn’t rain
63. I want to give him to eat. A. something English B. some English thing C. English something D. anything English
64. He writes . A. good enough B.enough good C.enough well D. well enough
65. —I’m very glad Beijing can be the host (东道主) for the 2008 Olympic Games. — . A. So am I . B. So I am C. So do I D. So I do 66. In the Iraq War(伊拉克战争) people lost their lives. We are against (反对) any war. We need peace(和平). A. thousand of B. thousands of C. about ten hundreds D. hundred of
67. I like ______ music, but I don’t like ______ music of the film. A./, the B.the, / C.the, the D./, /
68. I don’t think ______ necessary to tell him about it right now. A.this B. that C.it D.himt 69. Today isn’t so cold ___________ yesterday. A.like B.for C.as D.so
70. It’s too small. Give me a one ,please. A、bigger B、biger C、biggest D、bigest
71、My mother is in our family. A、busier B、busiest C、the busiest D、the most busy
72、We’ll have a party the evening of New Year’s Day. A、in B、on C、at D、to
73、Can I have a cake nuts inside? A、has B、have C、in D、with
74、The opposite of “behind” is . A、in front of B、in the front of C、front D、before
75、When did those men the station, do you know? A、got to B、get C、reach to D、reach
76、I’d like you to the zoo with me. A、going B、to go C、went D、go
77. Lily doesn’t look .What’s the matter her? A. happy, with B. happily, with C. happy, of D. happily, of
78. Henry be at home because he phoned me from the farm just now. A. mustn’t B. isn’t able to C. may not D. can’t
79. Mike learns a lot about Internet. And . A. I don’t, either B. so do I C. so am I D. I am, too
80.Xiao Ming will come and play with me if he _____busy. A.is B. won’t be C. isn’t D. will be
81.My husband is ill. He’s . A. in hospital B. in the hospital C. on hospital D. at hospital
82.It took him over a month the novel. A. to finish read B. to finish reading C. finishing reading D. to finish reading
83. No hurry. There’s time left. A. little B. few C. a little D. a few
84. Please take _______your hat after coming into the classroom. A. out B. up C. off D. back
85. ________ elephant he is drawing! A. What a nice B. How a nice C. What nice D. how nice
86. We all find ______ very difficult to learn English well. A. this B. that C. it D. them
87. I don’t like this pen. Would you show me _______ one? A. other B. the other C. another D. others
88. “Thank you,” the man said ______ a smile _______ his face. A. on, on B. with, on C. at, in D. in, with
88. -- Do you like the story? -- Yes. It’s _________. Who wrote it? A. very an interesting story B. quite an interesting story C. an interesting very story D. an interesting quite story
89. -- What is he doing here? -- He is trying to _______ a song in English. A. sing B. singing C. sings D. to sing
90. Would you please _______ so much noise? A. don’t make B. not to make C. to not make D. not make
91.This question is than that one . A. difficult B.much difficult C .much more difficult D. most difficult
92.Of all the boys ,Li Lei jumps . A. Longer B. Longest C. farther D. farthest
93.—Have a nice weekend! — . A.Me ,too B.The same to you C.I don’t think so D. No, thanks
94.If it this Sunday, we will go out for a trip. A. rain B. will rain C. won’t rain D. doesn’t rain
95.—What are you drawing ,Han Mei? —A cat . — It’s cat! A. quite nice a B. a nice quite C. quite nice D. quite a nice
96. He stopped to get the stick and went on_______. A. to run B. running C. runs D. ran
97. The old man ran very___. Lin Tao ran much ___than the old man. A. faster; slowly B. fast; slowly C. slowly; faster D. more slowly; fast
98. In the sports meeting, Mike did____than John. He didn’t jump _______. A. bad; enough high B. worse; high enough C. worst; high enough D. worst; enough high
99. I heard her ______an English song in the next room at six o’clock. A. singing B. sing C. is singing D. sang
100. This made it easier for people ______ computers. A. use B. to use C. using D. used

第一个人的答案 大3了 很多东西都不记得了 可能会有错误。
1A 前面的句子是主谓结构 就用 So am I. 动宾结构 就用 So do I.
2D 这里面kind是形容词 a kind girl. 主体girl是名词 所以用 What.
3B You had better do or not do...
4A in hospital 是生病住院 in the hospital可能是在医院工作等
5C it指代之前说的某句英文 还是speak English.后句搭配的是tell story
6C would you please do sth.
7D arrive in/reach/get to后面都要加地点
8C leave是落下东西 forget是忘记事情 left是leave的过去式
9C with ... voice 用一种怎样的声音
10A sbA with sbB 主语是A sbA and sbB 主语是A和B
11D 虽然是nobody 但是没有出现not 后面问这件事是这样的么 指代事用it
12B 他跑得最快 当然就是班级没人比他跑得快了
13C a few是有几个 few是几乎没有 quite a few是相当多
14C happen or happened不确定 past是副词可以修饰动词
15B neither2者都不要 both都要 either2者当中1个都行
16C 题太难 所以few是基本没有人 a few是几个人 little和a little不可数
17A have是持有 延续动词borrow是暂短动词 不能借这个动作持续a moment
18C work是不及物动词 work on 致力于 work out 解决掉
19C 2500-word是一个复合词
20B It was a pleasure别人感谢你的帮助或款待 “不客气”


数学难题啊,帮个忙啦

(1)X²-5X+1=0,X²+1=5X
由于可以判断X不等于0,所以两边同时除以X
X+1/X=5
X²+X^(-2)
=X²+1/X²
=(X+1/X)²-2X×1/X
=5²-2
=23
(2)a²b²-6ab+9+b²+4b+4=0
(ab-3)²+(b+2)²=0
由于相加两部分都不小于0,因此只能都为0
b+2=0,b=-2
ab-3=0,ab=3
代入b=-2,a=-3/2
a^b=(-3/2)^(-2)=(-2/3)²=4/9


一道数学难题,请求大家的帮助

∵tanA,tanB是二次方程x²+mx+m+1的两个实数根
∴tanA+tanB=-m
tanA*tanB=m+1
∴tanC=tan[(180°-(A+B)]
=-tan(A+B)
=-(tanA+tanB)/(1-tanA·tanB)
=-(-m)/(1-m-1)
=-1
又∵0<∠C<180°
∴∠C=135°(3π/4)
所以,A,B为锐角.且小于45度,即0那么有:0<-m<2,0即-1m^2-4m+4>=8
(m-2)^2>=8
m>=2+2根号2,m=<2-2根号2.

综上所述,-1希望对你有帮助~


什么是Shell,Shell命令的两种执行方式

Shell本身是一个用C语言编写的程序,它是用户使用Unix/Linux的桥梁,用户的大部分工作都是通过Shell完成的。Shell既是一种命令语言,又是一种程序设计语言。作为命令语言,它交互式地解释和执行用户输入的命令;作为程序设计语言,它定义了各种变量和参数,并提供了许多在高级语言中才具有的控制结构,包括循环和分支。

它虽然不是Unix/Linux系统内核的一部分,但它调用了系统核心的大部分功能来执行程序、建立文件并以并行的方式协调各个程序的运行。因此,对于用户来说,shell是最重要的实用程序,深入了解和熟练掌握shell的特性极其使用方法,是用好Unix/Linux系统的关键。

可以说,shell使用的熟练程度反映了用户对Unix/Linux使用的熟练程度。

注意:单独地学习 Shell 是没有意义的,请先参考Unix/Linux入门教程,了解 Unix/Linux 基础。

Shell有两种执行命令的方式:
交互式(Interactive):解释执行用户的命令,用户输入一条命令,Shell就解释执行一条。
批处理(Batch):用户事先写一个Shell脚本(Script),其中有很多条命令,让Shell一次把这些命令执行完,而不必一条一条地敲命令。

Shell脚本和编程语言很相似,也有变量和流程控制语句,但Shell脚本是解释执行的,不需要编译,Shell程序从脚本中一行一行读取并执行这些命令,相当于一个用户把脚本中的命令一行一行敲到Shell提示符下执行。

Shell初学者请注意,在平常应用中,建议不要用 root 帐号运行 Shell 。作为普通用户,不管您有意还是无意,都无法破坏系统;但如果是 root,那就不同了,只要敲几个字母,就可能导致灾难性后果。


什么是Shell,Shell命令的两种执行方式

Shell有两种执行命令的方式:
交互式(Interactive):解释执行用户的命令,用户输入一条命令,Shell就解释执行一条。
批处理(Batch):用户事先写一个Shell脚本(Script),其中有很多条命令,让Shell一次把这些命令执行完,而不必一条一条地敲命令。

Shell脚本和编程语言很相似,也有变量和流程控制语句,但Shell脚本是解释执行的,不需要编译,Shell程序从脚本中一行一行读取并执行这些命令,相当于一个用户把脚本中的命令一行一行敲到Shell提示符下执行。

Shell初学者请注意,在平常应用中,建议不要用 root 帐号运行 Shell 。作为普通用户,不管您有意还是无意,都无法破坏系统;但如果是 root,那就不同了,只要敲几个字母,就可能导致灾难性后果。


上一篇:无屏电视

下一篇:无人自助售货机