单选题In the cylinder head of a two-stroke/cycle diesel engine, valves are used for（）Aair intakeBa fuel outletCcooling water inletsDexhausting combustion gas
单选题
In the cylinder head of a two-stroke/cycle diesel engine, valves are used for（）
A
air intake
B
a fuel outlet
C
cooling water inlets
D
exhausting combustion gas
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