单项选择题
You receive a call from the MSA OF CHINA addressed to all stations. The call begins with the words Pan-Pan (3 times). Which type of emergency signal would this be?（）.
A.Safety signal B.Urgency signal C.Distress signal D.Red alert signal
单项选择题 A continuous sounding of a fog-signal apparatus indicates（）.
单项选择题 All of the following are distress signals EXCEPT（）.
单项选择题 All of the following are distress signals under the Rules EXCEPT（）.
