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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

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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

單項(xiàng)選擇題

The piston rings are manufactured with a diameter （） the bore of the cylinder.

A.larger than
B.smaller than
C.equal to
D.none of the above

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