问题
单项选择题
The generators on your rig have shut down，leaving you without navigation lights. Which emergency signal would you transmit over the VHF radio to alert vessels in the area of your predicament? （）
A.Mayday，Mayday，Mayday
B.Pan，Pan，Pan
C.Security，Security，Security
D.Lights out，Lights out，Lights out
答案
参考答案：C