When will the float-free emergency position indicating radio beacon be activated after abandoning ship?（）<br>A:Immediately after floating free<br>B:After about one hour when the salt water activates the battery<br>C:Only when keyed by the radar of another vessel<br>D:Only when daylight activates the photovoltaic cell

When will the float-free emergency position indicating radio beacon be activated after abandoning ship?（）
A:Immediately after floating free
B:After about one hour when the salt water activates the battery
C:Only when keyed by the radar of another vessel
D:Only when daylight activates the photovoltaic cell

出自：海船船员证

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