【单项选择题】
Sign(s) of respiratory arrest requiring artificial respiration is(are)（）.
A、A.vomiting
B、B.blue color and lack of breathing
C、C.irregular breathing
D、D.unconsciousness
查看正确答案
A、The Morse code distress series S-O-S repeated 3 times followed by DE and the vessel's call sign B、A line of blip code on a radar screen outward from the SART's position along its line of bearing C、A line of blip code on a radar screen inward from the SART's position to its own ship along its line of bearing D、None of these
