Each cylinder has one starting valve which is usually opened by air pressure and closed by （）<br>A:nuts and bolts<br>B:new joints<br>C:spring force<br>D:sealing rings

Each cylinder has one starting valve which is usually opened by air pressure and closed by （）
A:nuts and bolts
B:new joints
C:spring force
D:sealing rings

出自：海船船员证

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