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单选题
In some type of two-stroke engines, besides some small holes for(), starting valve, safety valve, indicator cock, and central opening in each cylinder cover for mounting the()
A
fuel valves;exhaust valve
B
exhaust valves;inlet valve
C
fuel valves;inlet valve
D
exhaust valves;fuel valve
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is decided by the engine speed, constant at all engine speed
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two power strokes in a two-stroke/cycle engineC
one power stroke in a two-stroke/cycle engineD
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