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【单选题】
BJT三极管电路如图所示,判断管脚1、2、3分别为三极管的什么极?
A.
（a）图①为集电极，②为发射极,③为基极;（b）图①为基极，②为集电极,③为发射极
B.
（a）图①为发射极，②为集电极,③为基极;（b）图①为基极，②为发射极,③为集电极
C.
（a）图①为基极，②为发射极,③为集电极;（b）图①为基极，②为集电极,③为发射极
D.
（a）图①为集电极，②为发射极,③为基极;（b）图①为基极，②为发射极,③为集电极
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A.
轮辋
B.
轮缘
C.
辐板
D.
轮毂
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【单选题】脱轨是指机车车辆的车轮落下轨面(包括脱轨之后又自行复轨)或车轮轮缘顶部()轨面(因作业除外)。
A.
落下
B.
爬上
C.
低于
D.
高于
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【判断题】机车、车辆、动车、重型轨道车（包括拖车）的车轮落下轨面（包括脱轨后又自行复轨）的就是脱轨事故。
A.
正确
B.
错误
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正确
B.
错误
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【单选题】Would you please buy some paper on your way to the office? There______left.
A.
aren't many
B.
are very few
C.
isn't much
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【单选题】各力作用线在同一平面内且汇交于一点的力系称为( )。
A.
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平面平行力系
C.
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【判断题】脱轨指机车车辆的车轮落下轨面（包括脱轨后又自行复轨），或车轮轮缘顶部高于轨面（因作业需要的除外）。
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正确
B.
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【多选题】Please read the following sentences and tick the functions of a cover letter according to your understanding.
A.
A cover letter introduces you and your resume to an employer.
B.
A cover letter is as important as a resume.
C.
A cover letter demonstrates your writing skills.
D.
A cover letter can be sent to all employers.
E.
A cover letter gives factual information and details about your career so far.
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【简答题】You may open your electronic mail and find information about how to buy medicine, cheap airline tickets, books and, of course, computers and computer products．There may also be offers for investment d...
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【单选题】Reading the following passage and tick your answer 1 . what does Buy Nothing Day mean?
A.
It's a special day when people are encouraged not to buy anything.
B.
On that day, shops are all closed , so you can't buy anything.
C.
On that day, shops are soo crowded that you can't get what you want.
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【单选题】脱轨系指机车车辆的车轮落下轨面（包括脱轨后又自行复轨），或车轮（）顶部高于轨面（因作业需要的除外）
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【单选题】Would you please buy some paper on your way to the office? There______left.
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【单选题】各力作用线在同一平面内且汇交于一点的力系称为( )。
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【多选题】Please read the following sentences and tick the functions of a cover letter according to your understanding.
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查看完整题目与答案
【简答题】You may open your electronic mail and find information about how to buy medicine, cheap airline tickets, books and, of course, computers and computer products．There may also be offers for investment d...
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【单选题】Reading the following passage and tick your answer 1 . what does Buy Nothing Day mean?
A.
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B.
On that day, shops are all closed , so you can't buy anything.
C.
On that day, shops are soo crowded that you can't get what you want.
查看完整题目与答案