问题:
A . A conditional or partial exemption may be granted,in exceptional circumstances,for a single voyage outside the sea area for which the vessel is equipped
B . Once a compulsory vessel's GMDSS station has been fitted and inspected,the station must be inspected only once every five years
C . All passenger vessels and all cargo vessels that are 300 Gross Tons or larger must comply
D . Compulsory vessels must carry at least two licensed GMDSS Radio Operator
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