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.<br>A:not less than twice<br>B:greater at least twice than<br>C:not greater twice than<br>D:larger three times than

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

出自：海船船员证

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