单选题The WWNWS is a coordinated global service for the broadcast by radio of vital information on（）to marine navigation.Aship’s movementBsafetyCship’s managementDhazards
单选题
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
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