单项选择题
A.the scavenging air B.the exhaust gases C.the mixed air D.the spray oil
The plunger may be rotated in the barrel by a rack and ...
单项选择题The plunger may be rotated in the barrel by a rack and （） on a sleeve which is keyed to the plunger.
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
