When stand-by engine instructions have been received, it’s necessary to make it sure that all valves in the various systems are（）<br>A:operational<br>B:open<br>C:closed securely<br>D:at middle position

When stand-by engine instructions have been received, it’s necessary to make it sure that all valves in the various systems are（）
A:operational
B:open
C:closed securely
D:at middle position

出自：海船船员证

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