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问题 单项选择题

蜗杆的轴向模数用字母（）表示。

A.B

B.M

C.mx

D.V

答案

参考答案：C

选择题
If he had spent more time practising speaking English before，he________able to speak it much better now.                                                   
A．will beB．would be
C．has beenD．would have been
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选择题

台湾岛隔台湾海峡与（    ）省相望

A．广东

B．浙江

C．福建

D．海南
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