单选题A vessel is underway with a work stage rigged over the side. A seaman may work on the stage，but only when（）.Awearing a life jacketBwearing a safety harness secured to the stageCwearing both a life jacket and a safety harness secured to the stageDthe vessel is not making way
单选题
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
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