单项选择题

Before replacing a piston you should check the rings to see that all clearances and gaps are （） the permissible tolerances.

A.above
B.at
C.over
D.within

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单项选择题
Before replacing a piston you should check that all rings are （）.

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