单项选择题

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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单项选择题

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)

单项选择题

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

单项选择题

A.well ventilated
B.well clean
C.in good order
D.more room