单项选择题
A.a separate motor B.a cam C.a generator D.a chain
The fuel injector injects a fine spray of fuel into the...
单项选择题The fuel injector injects a fine spray of fuel into the hot air and combustion （）, producing much high pressure in the gases.
A.has begun B.takes place C.occurs D.happens
The fresh air coming in through the inner air ports, is...
单项选择题The fresh air coming in through the inner air ports, is compressed by（） to a higher pressure.
A.the cylinder head B.the cross-head C.the moving piston D.the stationary piston
The fourth engineer accompanied by the workers on oil b...
单项选择题The fourth engineer accompanied by the workers on oil barge measures the oil levels, temperature and （） in the tanks.
A.tank table B.trim C.water contents D.oil pressure
