单项选择题
The piston supporting body is mainly subjected to （） stress.
A.pushing
B.centrifugal
C.stretch
D.compressive
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单项选择题
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 -
单项选择题
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 -
单项选择题
The piston ring grooves for a standard engine are （）
A.chromium-plate against wear
B.anti-corrosion treated
C.white metal lined against wear
D.flame hardened against wear
