单选题Class C EPIRBs are（）.Amanually activated and operate on maritime (VHF) channelsBautomatically activated and operate on maritime (VHF) channelsCmanually operated and detected by satelliteDautomatically operated and detected by satellite
单选题
Class C EPIRBs are（）.
A
manually activated and operate on maritime (VHF) channels
B
automatically activated and operate on maritime (VHF) channels
C
manually operated and detected by satellite
D
automatically operated and detected by satellite
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