单项选择题

Lubricating oil for an engine is stored at the bottom of the （）, known as the sump or in a drain tank located beneath the engine.

A.sea cheat
B.air receiver
C.crankcase
D.water box

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单项选择题

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

单项选择题

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

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)