单项选择题

Before replacing a piston you should check that all rings are （）.

A.free
B.fastened
C.broken
D.stuck

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单项选择题
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
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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