题目内容

粗车能达到的加工精度是()。

A. IT12-IT11
B. IT8-IT6
C. IT6-IT5
D. IT4-IT3

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精车能达到的加工精度是()。

A. IT12-IT11
B. IT10-IT8
C. IT8-IT6
D. IT6-IT5

精车表面粗糙度Ra可以达到()um。

A. 1.6-0.8
B. 12.5-6.3
C. 50-12.5
D. 0.02-1.25

When the law is implemented, the awareness of environmental pollution can be enhanced

A. 对
B. 错

Since the invention of plastic bags, our life has been facilitated to the largest extent.

A. 对
B. 错

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