單項選擇題

Low compression results from （）.

A.a worn cylinder
B.broken piston rings
C.either A or B
D.none of the above

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單項選擇題

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

單項選擇題

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)

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