What is the speed of the crankshaft in a four-stroke/cycle engine when the camshaft is turning at 750 rpm?（）

[单选题]What is the meaning “speed is not of primary importance”? （）A . Speed is importantB . Speed is not the most importantC . Speed is mainly importantD . Speed is first important

[单选题]All marine low-speed diesels are of what design?（）A . Four-strokeB . Two-strokeC . Electronic ignitionD . Forced exhaust

[单选题]The crankshaft deflection is at first to be （） before and after repair.A . disassembledB . renewedC . measuredD . regulated

[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]（） of an engine crankshaft can be detected by measuring deflections of crank webs for each unit of the engine.A . MisalignmentB . LengthC . StrengthD . Stresse

[单选题]When a crankshaft （） outside the engine, it should be carefully supported in a manner which will avoid imposing high bending moments on it.A . has to be handledB . may be handledC . has being handledD . will be handling

[单选题]The crankshaft of diesel engine is supported by （）.A . tension stretchB . tie rodsC . through boltsD . main bearing

[单选题]The crankshaft receives and transmits the full working power of the engine and is subjected to fluctuating （）.A . bending stresses弯曲应力B . torsion stresses扭转应力C . shear stresses剪应力D . All of the above

[单选题]The crankshaft is of the semi built type, with the journal （） the forged or cast steel crank throws.A . being shrunk intoB . to be shrunk intoC . to be shrunk withD . shrinking into

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