单项选择题
A.piston skirt B.piston crown C.guide way D.cross-head
A separate piston cooling system is used to limit any c...
单项选择题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
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
