单项选择题

Before being used the fuel service tank should be drained of （）.

A.soda solution
B.mechanical impurities
C.ballast
D.water and residuals

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单项选择题
Before a marine diesel engine is started the cylinders and pistons must be （）.

A.cooled to appropriate temperature
B.warmed up gradually to appropriate temperature
C.opened up and renewed
D.ground and polished
单项选择题
Before stand-by is rung on the engine telegraph, it is usual to give the main engine （） ahead and astern.

A.a brief trial with turning gear
B.a brief trial on power
C.a long trial by steering gear
D.one minutes trial with windlass
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