单项选择题
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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相关考题
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单项选择题
A vessel is to make a voyage between New York and San Juan，Puerto Rico，and return. The crew should be signed on（）.
A.Coastwise Articles
B.Foreign Articles
C.Intercoastal Articles
D.no articles -
单项选择题
A vessel is overtaking when she can see which light(s) of a vessel ahead?（）
A.Only the stern light of the vessel
B.One sidelight and a masthead light of the vessel
C.Only a sidelight of the vessel
D.The masthead lights of the vessel -
单项选择题
A vessel is inclined at an angle of loll. In the absence of external forces，the righting arm (GZ) is（）.
A.positive
B.negative
C.zero
D.vertical
