It is important to use only pure lead and to choose a thickness of wire which is greater than the normal allowable clearance but （） this amount.

时间：2020-08-14 06:19:32 关键词：lead,pure,and

It is important to use only pure lead and to choose a thickness of wire which is greater than the normal allowable clearance but （） this amount.

A.not less than twice

B.greater at least twice than

C.not greater twice than

D.larger three times tha

答案解析

C

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