单项选择题
The ship is not very stable，please（）when making a turn.
A.stop down B.speed down C.slow down D.down slow
单项选择题 The radiotelegraphy safety messages for condition indicating distress，urgency and safety，respectively，are（）.
单项选择题 The most likely time for oil pollution while bunkering is when（）.
单项选择题 Smoking in bed on a ship is prohibited（）.
