单项选择题
A.between；to B.either；or C.from；to D.neither；nor
A separate piston cooling system is used （） any contami...
单项选择题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
A reduction in load on a diesel engine results in （） of...
单项选择题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
A number of cylinder liners are enclosed in one cast ir...
单项选择题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
