单项选择题

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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It is important that the water （） very often as this can lead to increased deposits.

A.not be changed
B.be changed
C.should not be changed
D.should be changed

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It is abnormal that when the engine is being turned by the turning gear or by hand, （）.

A.water discharges from the indicator cocks
B.no water is leaking into crankcase
C.no water in the scavenge belt
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Increasing the temperature of a fuel will reduce its （）.

A.viscosity
B.pressure
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D.setting point