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單項(xiàng)選擇題

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

A.between；to
B.either；or
C.from；to
D.neither；nor

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單項(xiàng)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

單項(xiàng)選擇題

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