At sea，all required GMDSS equipment（other than survival craft equipment）must be proven operational by（）.<br>A:daily testing<br>B:either A or C<br>C:operational use of the equipment<br>D:testing at least every 48 hours

At sea，all required GMDSS equipment（other than survival craft equipment）must be proven operational by（）.
A:daily testing
B:either A or C
C:operational use of the equipment
D:testing at least every 48 hours

出自：海船船员证

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