单选题A Class A EPIRB is NOT（）.Aapproved by the CCSBdesigned for float free，automatic activationCoperated on 121.5/243 MHzDoperated manually
单选题
A Class A EPIRB is NOT（）.
A
approved by the CCS
B
designed for float free，automatic activation
C
operated on 121.5/243 MHz
D
operated manually
参考解析
解析：
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