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單項(xiàng)選擇題

Main bearings are required to support the crankshaft at each （）.

A.end
B.web
C.pin
D.journal

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單項(xiàng)選擇題

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

單項(xiàng)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