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（）Afuel valves；exhaust valveBexhaust valves；inlet valveCfuel valves；inlet valveDexhaust valves；fuel valve
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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