单项选择题
What best describes an anchor buoy?（）
A.A black ball that is hoisted when the ship anchors B.A buoy attached to the anchor C.A buoy attached to the scope of an anchor chain D.A mark of the number of fathoms in an anchor chain
单项选择题 What are the two main types of stud link chain?（）
单项选择题 What action should you take to compensate for the abovecurrent?（）
单项选择题 Under identical load conditions，nylon，when compared with natural fiber line，will stretch（）.
