單項(xiàng)選擇題

Low compression of diesel engine may result from （）

A.a worn cylinder
B.broken piston rings
C.any of A and B
D.none of the above

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單項(xiàng)選擇題

Leaky exhaust valve will result in which of the following?（）
(1) high exhaust temperature;
(2) low compression pressure;
(3) low firing pressure.

A.(1) and (2)
B.(1) only
C.(2) only
D.(1),(2) and (3)

單項(xiàng)選擇題

Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the （） and a recirculation system lubricating the running gear and cooling the piston.

A.cylinder liners and piston rings
B.main bearings
C.crankpin bearings
D.turboblower

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