單項(xiàng)選擇題Before pumping up the crankcase oil,（） should be worked by hand to minimize corrosive action on the liners.

A.the indicators
B.the starting valves
C.the cylinder lubricators
D.the turning gear


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1.單項(xiàng)選擇題Before being used the fuel service tank should be drained of （）.

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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

5.單項(xiàng)選擇題Because the castings of smaller engines are not so big and heavy, （） and cylinder block may be made in one piece.

A.the column
B.the jacket
C.cylinder cover
D.cylinder liner