单项选择题
A.navigational / typhoon B.traffic / meteorological C.marine / hurricane D.navigational / meteorological
Distress alerts will be relayed on the（）when the RCC co...
单项选择题Distress alerts will be relayed on the（）when the RCC considers it necessary.
A.dedicated system B.MSI broadcasts C.518KHZ D.channel 16
The WWNWS is a coordinated global service for the broad...
单项选择题The WWNWS is a coordinated global service for the broadcast by radio of vital information on（）to marine navigation.
A.ship’s movement B.safety C.ship’s management D.hazards
With the help of modern technology, ships are able to r...
单项选择题With the help of modern technology, ships are able to receive automated broadcast of safety messages（）.
A.by day or at night B.almost round the clock C.somewhat and sometime D.from sunrise and sunset
