单选题When will the float-free emergency position indicating radio beacon be activated after abandoning ship?（）AImmediately after floating freeBAfter about one hour when the salt water activates the batteryCOnly when keyed by the radar of another vesselDOnly when daylight activates the photovoltaic cell
单选题
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
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