A.a worn cylinder
B.broken piston rings
C.either A or B
D.none of the above
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A.a worn cylinder
B.broken piston rings
C.any of A and B
D.none of the above
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)
A.cylinder liners and piston rings
B.main bearings
C.crankpin bearings
D.turboblower
A.well ventilated
B.well clean
C.in good order
D.more room
A.present
B.prevent
C.avoid
D.provide
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