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單項(xiàng)選擇題

The pistons are cooled by oil supplied from the forced （） system.

A.fresh water
B.sea water
C.lubrication
D.fuel oil

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單項(xiàng)選擇題

The piston supporting body is mainly subjected to （） stress.

A.pushing
B.centrifugal
C.stretch
D.compressive

單項(xiàng)選擇題

The piston rings if found worn out （） and supplied by shipchandler.

A.must replace
B.must to be equipped
C.has to be repaired
D.have to be renewed