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單項(xiàng)選擇題

Distress alerts will be relayed on the（）when the RCC considers it necessary.

A.dedicated system
B.MSI broadcasts
C.518KHZ
D.channel 16

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

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