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單項(xiàng)選擇題

Vee-type engines have the connecting rods from two cylinders connected to each （） of the crankshaft.

A.throw
B.web
C.main bearing
D.deflection

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單項(xiàng)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

單項(xiàng)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

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