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單項(xiàng)選擇題

In some designs the cylinder oil is timed so that the oil injects only on the （）.

A.piston crown
B.piston groove
C.piston skirt
D.piston ring belt

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單項(xiàng)選擇題

In order to inspect both piston and cylinder wall thoroughly, the cylinder cover should be taken off and the piston should be （）.

A.craned out
B.rolled out
C.lifted out
D.turned out

單項(xiàng)選擇題

In order to increase the wearing resistance, the cylinder liner surfaces are sometimes （）.

A.aluminum-plated
B.bronze-plated
C.zinc-plated
D.chromium-plated

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