單項(xiàng)選擇題

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

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單項(xiàng)選擇題

The inside light in an inflatable liferaft is turned on（）.

A.automatically as the liferaft inflates
B.with a switch near the boarding handle
C.at night because the light has a photosensitive switch
D.by screwing the bulb in after the raft is inflated

單項(xiàng)選擇題

The hydrostatic release on the inflatable liferafts on a fishing vessel must be（）.

A.replaced annually
B.tested monthly
C.serviced annually
D.overhauled quarterly