向盛有红棕色二氧化氮气体的集气瓶里投入几小块烘烤过的木炭，红棕色会消失的原因是______．

A J-chaser is used to（）.

A.transfer a pennant wire to the anchor handling vessel

B.clean chain as it is hauled into the rig

C.lower spring buoys into the water

D.retrieve an anchor after the buoy has been lost