The lights on the outside of the canopy on an inflatable liferaft operate（）.<br>A:by turning the globe clockwise<br>B:by a switch at each light<br>C:by a light sensor<br>D:automatically when the raft is inflated

The lights on the outside of the canopy on an inflatable liferaft operate（）.
A:by turning the globe clockwise
B:by a switch at each light
C:by a light sensor
D:automatically when the raft is inflated

出自：海船船员证

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