单项选择题
What is normally used to pass a mooring line to a dock?（）
A.Distance line B.Gantline C.Heaving line D.Tag line
单项选择题 What happens to the efficiency of an anchor when it is moved from sand to mud?（）
单项选择题 What form of ice is of land origin?（）
单项选择题 What does the term TO NAVIGATE WITH CAUTION mean?（）.
