單項選擇題

The engine may lose power or slow down during running, when this occurs, the first cause possible may be hot bearings and （） of the pistons in the cylinders.

A.crack
B.knocking
C.leaking
D.seizure

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單項選擇題

The engine is started with （） supplied from air receivers.

A.pressure oil
B.pressure water
C.compressed air
D.cooling water

單項選擇題

The engine is reversed by axial displacement of the camshafts In order for this to be carried out, the cams are （） with inclined transition faces.

A.lathed
B.shaped
C.shrunk
D.developed

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