单项选择题
The transmission system transmitting power from the engine to the propeller is composed of shafts, bearings, and（）
A.propeller B.flying wheel C.main engine D.crankshaft
单项选择题 Which of the followings will affect the spray of fuel oil?（）
单项选择题 When the direction handle of telegraph is moved, the relative position of camshaft and crankshaft will be（）
单项选择题 Which one of the followings may not be checked before engine starting?（）
