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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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

The piston moving up and down keeps the crankshaft （）.

A.to revolve
B.revolved
C.revolving
D.to be revolved