Crankshafts of medium speed engines are （） from a single piece of steel.

[单选题]On a medium-speed main propulsion diesel engine, the crank-pin or crank journalbearings receive lubricating oil from( ).A．a spindle lubricatorB．an oil jetC．internal splashingD．drilled passages in the crankshaft

[单选题]The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate on the （） cycle.A . two-strokeB . four-stokeC . long-strokeD . short-stroke

[单选题]Most medium and slow speed diesels are started by what medium?（）A . Electric starting motorsB . HydraulicsC . Compressed airD . Ether

[单选题]On a medium-speed main propulsion diesel engine, the crank-pin or crank journal bearings receive lubricating oil from （）.A . a spindle lubricatorB . an oil jetC . internal splashingD . drilled passages in the crankshaft

[单选题]Pistons of marine medium speed diesel engines may be made of （） in order to keep the weight down for balancing purpose at high speed.A . leadB . forged steelC . alloy steelD . aluminum alloy

[单选题]On a turbo-charged, medium-speed diesel engine, which of the following problems is an indication of a restricted air intake passage?（）A . Engine is hard to startB . Engine missesC . Surges at governed RPMD . Coolant temperature is too low

[单选题]Passages are drilled in the crankshafts of diesel engines to provide lubricating oil to the （）.A . main bearingsB . connecting rod bearingsC . piston pin bushingsD . All of the above

[单选题]当出现“SPEED，SPEED，SPEED”的语音警告时表示：（）A .速度超限B .当前推力不足以通过俯仰操纵来恢复正常飞行C .速度偏离选择或管理的速度

[单选题]Propeller pitch speed minus ship speed divided by the propeller pitch speed is termedA．apparent slipB．true slipC．pitchD．propulsive efficiency

[单选题]Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed ___.A．apparent slipB．true slipC．pitchD．propulsive efficiency