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【单选题】
下列关于,电动机按运转速度分类错误的是A.
高速电动机
B.
低速电动机
C.
恒速电动机
D.
无速电动机
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反馈参考答案：
举一反三
【简答题】两个弯矩图的叠加不是指图形的简单拼合，而是指两图对应的（）叠加。
【单选题】He had promised to come and help us, and ___.
A.
so did he
B.
so he did
C.
so had he
D.
so he had
【单选题】—Don't worry. He'll come and help you. — he doesn't come? [ ]
A.
What
B.
Why
C.
What if
D.
How if
【简答题】Don't sit there ________ nothing. Come and help me with this table. A. do B. to do C. doing D. and doing
【单选题】— I've asked only one person to come and help us-Sam. — _____ he doesn't come? [ ]
A.
How about
B.
What about
C.
If only
D.
What if
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