单项选择题
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
D.the rpm is lower than the speed of Dead Slow Ahead -
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A.viscosity
B.pressure
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A.it is dirty
B.it is leaky
C.it has been renewed
D.all the above
