A vessel is underway with a work stage rigged over the side. A seaman may work on the stage，but only when（）.<br>A:wearing a life jacket<br>B:wearing a safety harness secured to the stage<br>C:wearing both a life jacket and a safety harness secured to the stage<br>D:the vessel is not making way

A vessel is underway with a work stage rigged over the side. A seaman may work on the stage，but only when（）.
A:wearing a life jacket
B:wearing a safety harness secured to the stage
C:wearing both a life jacket and a safety harness secured to the stage
D:the vessel is not making way

出自：海船船员证

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