单项选择题

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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单项选择题

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

单项选择题

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

单项选择题

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