（）, which consisted of seven short blasts and one prolonged blast, all passengers have to go to their assembly station.<br>A:When the distress alert is sounded<br>B:When the emergency equipment is switching on<br>C:When the general emergency alarm is sounded<br>D:When the distress broadcast is sounded

（）, which consisted of seven short blasts and one prolonged blast, all passengers have to go to their assembly station.
A:When the distress alert is sounded
B:When the emergency equipment is switching on
C:When the general emergency alarm is sounded
D:When the distress broadcast is sounded

出自：海船船员证

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