单项选择题
With one or more cylinders out of operation, the engine speed must be reduced because（）
A.in such cases, the air supply is no longer optimal, the thermal load will be higher B.governor hunting will occur C.torsional vibrations as other mechanical vibrations may occur D.all of the above are correct
单项选择题 A few spots of turbocharger can be caused by（） ①crash stop of engine ② rapid increased of engine speed
单项选择题 The function of synchronous compensating machine is to（）
单项选择题 What is head tank in the closed cooling water system used for?（）
