船舶主推进装置1..2船舶柴油机装置1..2.4船舶柴油机的运行管理Some medium and high-speed diesel engines require reduction gear units to provide a useful propeller speed. In most reduction gears, the bull gear（重载齿轮） （ ）.

Some medium and high-speed diesel engines require reduction gear units to provide a useful propeller

A、 must chum the oil in the sump
B、 is connected to the propeller shaft
C、 is driven at the highest RPM
D、 compensates for alignment variations between the engine and pinion gear

Some medium and high-speed diesel engines require reduction gear units to provide a useful propeller

A、

must churn(搅拌)the oil in the sump

is connected to the propeller shaft

is driven at the highest r/min

compensates(补偿) for alignment variations between the engine and pinion gear(小齿轮)

船舶主推进装置1..2船舶柴油机装置1..2.4船舶柴油机的运行管理The diesel engine valve subjected to most severe conditions of service

A、cylinder exhaust valve
B、air starting valve
C、air inlet valve
D、cylinder relief valve

船舶主推进装置1..2船舶柴油机装置1..2.4船舶柴油机的运行管理An indication of an overloaded main propulsion diesel engine is （ ）

A、white smoke in the exhaust
B、high exhaust gas temperature readings
C、sparks in the exhaust
D、blue smoke in the exhaust