（） is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.<br>A:An air receiver<br>B:An operating valve<br>C:An automatic valve<br>D:An air distributor

（） is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.
A:An air receiver
B:An operating valve
C:An automatic valve
D:An air distributor

出自：海船船员证

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