Class C EPIRBs are（）.<br>A:manually activated and operate on maritime (VHF) channels<br>B:automatically activated and operate on maritime (VHF) channels<br>C:manually operated and detected by satellite<br>D:automatically operated and detected by satellite

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

出自：海船船员证

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