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


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1.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

2.單項(xiàng)選擇題VIT means ()

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

3.單項(xiàng)選擇題Under manoeuvring condition the main engine may run on ().

A.gas oil
B.marine diesel oil
C.residue oil
D.crude oil