单项选择题
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
A vessel，which does not normally engage in towing opera...
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
A vessel sounding a fog signal of one short，one prolong...
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
A vessel showing a yellow light over a white light at n...
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
