单项选择题
A.a fairlead block B.a swivel pin for the topping lift block C.a triangular steel plate with a hole at each corner D.the lower block of a multiple part topping lift
A face line is used to（）.A.prevent barge movement in a ...
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
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
