单项选择题
A.steering gear B.turning gear C.steering wheel D.turning cycle
At the top of the A-frames there is a strong cast iron ...
单项选择题At the top of the A-frames there is a strong cast iron frame called （）.
A.cylinder liner B.cylinder cover C.the gear box D.the scavenging box
At least （） cylinders in four-stroke engine will be con...
单项选择题At least （） cylinders in four-stroke engine will be configured to ensure that the engine can be started with the crankshaft at whatever position.
A.6 B.2 C.12 D.8
As the plunger moves up, the ports are closed and the f...
单项选择题As the plunger moves up, the ports are closed and the fuel （） and delivered to the injector nozzle at very high pressure.
A.being compressed B.to be pumped up C.is pressurized D.are built up
