单项选择题
A.gear B.nonpositive displacement C.positive displacement D.rotary
The pump has a constant stroke and the amount of fuel d...
单项选择题The pump has a constant stroke and the amount of fuel delivered is regulated by rotating （） which has a specially arranged helical groove cut into it.
A.the pump cylinder B.the pump cam C.the pump plunger D.the pump miler
The projection on a shaft designed to change circular m...
单项选择题The projection on a shaft designed to change circular motion into up and down or back and fore motion is called （）.
A.wheel B.crankshaft C.running gear D.cam
The process to remove exhaust gases by blowing in fresh...
单项选择题The process to remove exhaust gases by blowing in fresh air is called （）.
A.charging B.supercharging C.starting D.scavenging
