单项选择题

2.一端固定,一端铰支,长度因数取值(          )。
A、1
B、0.5
C、0.7
D、2

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单项选择题

Thank you for inviting me. – ()

A.I really had a happy time.
B.Oh, it’s too late.
C.Thank you for coming.
D.Oh, so slowly?

不定项选择

A.正确
B.错误

单项选择题

we are going to have a singing party tonight. Would

A.I’m afraid not, because I have to go to an important meeting.
B.Of course not. I have no idea.
C.No, I can’t.
D.That’s all set.