单项选择题
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
A drift lead indicates that the vessel is dragging anch...
单项选择题A drift lead indicates that the vessel is dragging anchor when the line is（）.
A.taut and leading forward B.slack C.leading out perpendicular to the centerline D.leading under the hull
A deepwell pump is a type of（）.A.screw pumpB.centrifuga...
单项选择题A deepwell pump is a type of（）.
A.screw pump B.centrifugal pump C.eductor D.gear pump
A bowline is used to（）.A.join lines of equal sizeB.form...
单项选择题A bowline is used to（）.
A.join lines of equal size B.form a temporary eye (loop) at the end of a line C.be a stopper D.keep a line from fraying
