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【单选题】
以下关于铰链约束的说法中,正确的是( )A.
光滑铰链约束和光滑球铰链约束本质上都是光滑接触约束，约束力其实只有一个；
B.
光滑圆柱铰链中，销钉所串起来的两个构件它们所受到的约束力是一对作用力和反作用力，如果表示交分量的形式，则是两对作用力和反作用力；
C.
光滑铰链、球铰链、止推轴承这几种工程中的常见约束，虽然约束力可以用两个或者三个正交分力表示，但约束力本质上都是一个力；
D.
光滑铰链约束类型中包含径向轴承、光滑圆柱铰链、固定铰支座、光滑球铰链等。
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【单选题】PART C Directions: You will hear three dialogues or monologues. Before listening to each one, you will have 5 seconds to read each of the questions which accompany it. While listening, answer each que...
A.
Sick.
B.
Dizzy.
C.
Exhausted and weak.
D.
Painful.
【单选题】SECTION A CONVERSATIONS Directions: In this section you will hear several conversations. Listen to the conversations carefully and then answer the questions that follow. 听力原文：M: Good morning. W: Good ...
A.
Teaching in a university.
B.
Working in a local radio studio.
C.
Working as a student reporter.
D.
Working for a newspaper.
【单选题】Part B Directions: You will hear four dialogues or monologues. Before listening to each one, you will have 5 seconds to read each of the questions which accompany it. While listening, answer each ques...
A.
He is an undergraduate student.
B.
He has to drive to the university because he lives far away.
C.
lie disagrees with the woman about the parking regulations.
D.
He does not know the woman.
【单选题】PART C Directions: You will hear three dialogues or monologues. Before listening to each one, you will have 5 seconds to read each of the questions which accompany it. While listening, answer each que...
A.
They occur once in every one hundred births.
B.
They seldom occur.
C.
They occur once in every eighty-six births.
D.
They will grow up with strange behaviours.
【简答题】编制分录: 收到泛美集团投资资金 20000 美元,汇率 1 : 6.8376 。转账支票号 ZPW001, ( 收款凭证 ) 摘要:收到投资
【单选题】Part B Directions: You will hear four dialogues or monologues. Before listening to each one, you will have 5 seconds to read each of the questions which accompany it. While listening, answer each ques...
A.
He is fine.
B.
He is sick.
C.
He is crazy about Internet.
D.
He feels depressed for no reason.
【简答题】如何清除冰河木马?请描述具体步骤。
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