无码高清视频|成人自拍视频|欧美成人午夜无码A片秀色直播|草美女视频网站|美女被操网站在线观看

單項(xiàng)選擇題

The satisfactory operation of diesel engine exhaust valves usually depends on（）

A.the proper back pressure
B.the cooling water temperature
C.correct timing and proper seating
D.accurate metering and the exhaust temperature

你可能感興趣的試題

單項(xiàng)選擇題

If an auxiliary diesel engine frequently stalls, the trouble may be caused by （）

A.low exhaust back pressure
B.air in the fuel system
C.gasket blow-by or leakage
D.incorrect assembly of idler springs

單項(xiàng)選擇題

A diesel engine cranks properly during starting but immediately stallsWhich of the following systems is most likely at fault?（）

A.Hydraulic starting
B.Electric starting
C.Ignition
D.Fuel

<optgroup id="sbeq9"></optgroup>