问题描述：
[单选]
Once all cylinders are firing regularly，（）is shut off．
A．the exhaust valve
B．the starting air
C．the inlet valve
D．the fuel oil
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答案解析：无
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答案解析：无
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上一篇：Opening of the cylinder（）will admit compressed air into the cylinder．
下一篇：Once a scavenge fire is detected， fuel should be shut off from the affected cylinders and cylinder lubrication increased（）the risk of seizure．
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