题目内容
What information is promulgated by the international SafetyNET?
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Which one of the following frequencies is used in national service of China?
How many NAVAREAs are there in the world?
What service was established by IMO and IHO for the purpose of coordinating the transmission of navigational warnings to ships in coordinated geographical areas?
In general terms, what system are used for the promulgation of MSI (Maritime Safety Information)?
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