问题
单项选择题
气动阀门定位器是按（）原理工作的。
A、负反馈
B、杠杆
C、力矩/位移平衡
D、正反馈
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
气动阀门定位器是按（）原理工作的。
A、负反馈
B、杠杆
C、力矩/位移平衡
D、正反馈
参考答案：C
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| There are thousands of people across the United States without any food or shelter (住所)．Every Saturday or Sunday night,my family and I go out and__1__the homeless people in the city. There is one__2__thing I like to mention here.Before we begin our__3__,my family and I do not eat.We do this__4__we know how it feels to be hungry.We all get together in the kitchen and__5__the food.We then__6__ the food for 30 or more people.I like to write a special__7__on the bags like"God loves you"． A lot of people__8__homeless people.Not all homeless people are bad people.Some are really__9__.Many people hate them__10__no good reason.In the beginning,when my family and I went out on the street,we had to__11__their trust.Later,as they__12__us every week,they started to trust us.We__13__ know some of their names.We all have to keep in mind that they also have__14__.Some of them shake our hands for giving them food,and__15__us.Some of them do really funny dances because they are __16__. We have become__17__close to a man named Tony and his wife.After meeting with them several times,he has told us a lot about his__18__.He graduated from college and has a PHD.He used to teach French and Spanish. After we get done feeding the homeless,it makes me__19__what I have at home.Sometimes it makes me sad,and makes my mom cry.I love feeding the homeless,and__20__in someone's life. | |||
| ( )1. A.visit ( )2. A.common ( )3. A.show ( )4. A.so ( )5. A.design ( )6. A.bag ( )7. A.passage ( )8. A.please ( )9. A.helpful ( )10. A.for ( )11. A.bring ( )12. A.served ( )13. A.hardly ( )14. A.words ( )15. A.change ( )16. A.happy ( )17. A.only ( )18. A.dream ( )19. A.want ( )20. A.taking care | B. introduce B. exciting B. journey B. when B. prepare B. cook B. saying B. help B. nice B. at B. earn B. told B. never B. looks B. thank B. great B. too B. future B. appreciate B. watching out | C. save C. special C. vacation C. if C. buy C. fetch C. note C. love C. funny C. of C. create C. saw C. sometimes C. desires C. impress C. surprised C. also C. life C. keep C. showing up | D. feed D. embarrassing D. meal D. because D. give D. find D. message D. misunderstand D. beautiful D. on D. share D. needed D. even D. feelings D. disappoint D. bored D. really D. friend D. think D. making a difference |