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單項(xiàng)選擇題

The lubricating oil is pumped from the drain tank, very often with （） in the suction line.

A.a filter
B.a strainer
C.a magnetic filter
D.a fine strainer

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單項(xiàng)選擇題

The lube oil in the bearings is drawn from a （）, usually located in the bedplate.

A.tank
B.sump
C.vessel
D.bottle

單項(xiàng)選擇題

The lowest ring of a piston is （）.

A.a coil spring
B.a sealing ring
C.an oil distributor ring
D.main seal ring