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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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单选题It is important that the water （） very often as this can lead to increased deposits.A
not be changedB
be changedC
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考题
单选题When towing in an open seaway，it is important to use a towing line（）.A
made only of wire rope，due to possible weather conditionsB
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with little dip to gain maximum control of the tow
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