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單項選擇題

Valve overlap is the period during which （）.

A.the inlet valve is open
B.the exhaust valve is open
C.both valves are closed
D.both valves are open

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單項選擇題

Valve gear knocks are more easily located while the engine （）.

A.is running
B.stops
C.is repaired
D.lacks of oil

單項選擇題

VIT means （）

A.variable injection timing
B.variable inlet tonnage
C.vertical incoming tonnage
D.vertical inlet tank

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