常用地址符（）代表进给速度。 A.F B.R C.S D.Y_爱下问搜题

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问题单项选择题

常用地址符（）代表进给速度。

A.F

B.R

C.S

D.Y

答案

参考答案：A

选择题

There _____ many kinds of birds around here, but now we seldom see them because of the air pollution.

A. had
B. used to have
C. used to be
D. are

问答题简答题

车辆的基本构造