单项选择题
A.stop down B.speed down C.slow down D.down slow
The radiotelegraphy safety messages for condition indic...
单项选择题The radiotelegraphy safety messages for condition indicating distress，urgency and safety，respectively，are（）.
A.SOS，ZZZ，XXX B.SOS，UUU，SSS C.SOS，XXX，TTT D.SOS，TTT，UUU
The most likely time for oil pollution while bunkering ...
单项选择题The most likely time for oil pollution while bunkering is when（）.
A.final topping off is occurring B.first starting to receive fuel C.hoses are being blown down D.hoses are disconnected and being capped
Smoking in bed on a ship is prohibited（）.A.at all times...
单项选择题Smoking in bed on a ship is prohibited（）.
A.at all times B.during evening hours C.unless another person is present D.during drilling operations
