单项选择题
A.in any INMARSAT regions B.in each NAVTEX area C.at any distance D.in Areas A3 and A4
The frequency 518KHZ will be used to transmit（）and（）wan...
单项选择题The frequency 518KHZ will be used to transmit（）and（）wanings in NAVTEX.
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
