单项选择题
A.pinion arrangement B.push rod C.handle bar D.cam device
The plunger in the fuel injector pump, usually operated...
单项选择题The plunger in the fuel injector pump, usually operated by a （）, is driven up and down when working.
A.crankshaft B.camshaft C.piston rod D.rack and pinion
The pistons are cooled by oil supplied from the forced ...
单项选择题The pistons are cooled by oil supplied from the forced （） system.
A.fresh water B.sea water C.lubrication D.fuel oil
The piston supporting body is mainly subjected to （） st...
单项选择题The piston supporting body is mainly subjected to （） stress.
A.pushing B.centrifugal C.stretch D.compressive
