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【单选题】
手法动力学特征中的惯性特征是指( )A.
力矩
B.
冲量和冲量矩
C.
功和功率
D.
质量和转动的惯量
E.
杠杆的省力效益
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举一反三
【简答题】---Hi, Tom. Any idea where Jane is? ---She in the classroom. I saw her there just now. A．shall be B．should have been C．must be D．might have been
【单选题】— Tom is never late for work. Why is he absent today ? — Something _______ to him.
A.
must happen
B.
should have happened
C.
could have happened
D.
must have happened
【单选题】— Hi, Tom．Any idea where Mary is? — She in the reading room．I saw her there just now．
A.
shall be
B.
should have been
C.
should be
D.
might have been
【简答题】带传动由 主动轮、 和传动带组成。
【单选题】---Tom is so worried about the test that he said he was going to study all night. ----Tell him he should quit _________and get some help.
A.
to have worried
B.
to worry
C.
worring
D.
from worrying
【单选题】已知通用对话框名为Cd1g，则执行下列的( )语句，将弹出“打开文件”对话框。
A.
Cd1g．ShowOpen
B.
Cd1g．ShowSave
C.
Cd1g．ShowSaveAs
D.
ShowOpen Cd1g
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