In accordance with SOLAS，the batteries that power interior lighting in inflatable liferafts can be made to last longer by（）.<br>A:unscrewing the bulb during the daylight<br>B:switching the light on only when necessary<br>C:taking no action as there is no way on saving power<br>D:taking no action as they shut off automatically in daylight

In accordance with SOLAS，the batteries that power interior lighting in inflatable liferafts can be made to last longer by（）.
A:unscrewing the bulb during the daylight
B:switching the light on only when necessary
C:taking no action as there is no way on saving power
D:taking no action as they shut off automatically in daylight

出自：海船船员证

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