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
单项选择题 The expression STAND-BY ENGINE means:（）.
单项选择题 Some goods are missing（）terrible weather.
单项选择题 Should that kind of weather（），the two ships would touch each other.
