单选题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.Anot less than twiceBgreater at least twice thanCnot greater twice thanDlarger three times than
单选题
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 than
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