单项选择题
A yellow signal，floating in the air from a parachute，about 300 feet above the water，indicates that a submarine（）.
A.will be coming to periscope depth
B.will be coming to the surface
C.is on the bottom in distress
D.is in distress and will try to surface
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相关考题
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单项选择题
A vessel，which does not normally engage in towing operations，is towing a vessel in distress.She（）.
A.need not show the lights for a vessel engaged in towing，if it is impractical to do so
B.may show the lights for a vessel not under command
C.must show a yellow light above the stern light
D.must show the lights for a vessel towing -
单项选择题
A vessel sounding a fog signal of one short，one prolonged，and one short blast is indicating that the vessel is（）.
A.fishing
B.in distress
C.at anchor
D.not under command -
单项选择题
A vessel showing a yellow light over a white light at night is a vessel（）.
A.engaged in piloting
B.towing astern
C.engaged in fishing
D.in distress
