单项选择题
A face line is used to（）.
A.prevent barge movement in a lock B.secure two barges end-to-end C.secure barges to the towboat D.secure barges side-by-side
单项选择题 A drift lead indicates that the vessel is dragging anchor when the line is（）.
单项选择题 A deepwell pump is a type of（）.
单项选择题 A bowline is used to（）.
