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（）<br>A:fuel valves；exhaust valve<br>B:exhaust valves；inlet valve<br>C:fuel valves；inlet valve<br>D:exhaust valves；fuel valve

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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