单项选择题
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
单项选择题 The inside light in an inflatable liferaft is turned on（）.
单项选择题 The hydrostatic release on the inflatable liferafts on a fishing vessel must be（）.
单项选择题 The capacity of any liferaft on board a vessel can be determined by（）.
