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单项选择题

GMDSS is required for which of the following?

A．All vessels capable of international voyage.
B．SOLAS Convention ships of 300 gross tonnage or above.
C．Vessels operating outside of the range of VHF coastal radio stations.
D．Coastal vessels of less than 300 gross tonnage.

问答题

According to the different standards of import and export, international trade may be divided into (1) trade and (2) trade, both being statistical systems.