单项选择题
After deploying the anchor，a permanent chain chaser is（）.
A.removed from the anchor chain B.connected to a buoy at the anchor C.stripped back to the rig and secured D.connected to a buoy halfway down the chain
单项选择题 A whipping on a fiber line（）.
单项选择题 A whipping is（）.
单项选择题 A tackle by which the outer end of a boom is raised and lowered is the topping（）.
