静压导轨移动部件在全长的直线度误差，一般不超过（）A、0.02～0_爱下问搜题

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问题单项选择题

静压导轨移动部件在全长的直线度误差，一般不超过（）

A、0.02～0.03mm

B、0.01~0.02mm

B、0.001~0.002mm

D、0.1~0.2mm

答案

参考答案：B

单项选择题

We hadn’t realized that there would be a power cut so we were astonished when the whole house was () into darkness.

A. dropped

B. dived

C. drowned

D. plunged

单项选择题

排出井场的废水，必须符合国家《污水综合排放标准》（GB8978一88）的（）标准值。

A.一类

B.二类

C.三类

D.四类