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單項選擇題

A separate piston cooling system is used （） any contamination from piston cooling glands to the piston cooling system only.

A.to help
B.to limit
C.to protect
D.to remove

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A reduction in load on a diesel engine results in （） of speed of the crankshaft.

A.a reduction
B.an increase
C.an outing
D.a downwards

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A number of cylinder liners are enclosed in one cast iron casing to form a （）.

A.cylinder cover
B.cylinder block
C.cylinder frame
D.bed-plate