A chain stripper is used to（）.

A.prevent chain from clinging to the wildcat

B.clean the marine debris from the chain

C.flake chain from a boat's chain locker

D.clean chain prior to an x-ray inspection

下列不属于黑茶的是（）。

A、湖北老青茶

B、四川边茶

C、云南紧压茶

D、乌龙茶