单项选择题
A flounder plate，on a topping lift，is（）.
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
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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 -
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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
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A deepwell pump is a type of（）.
A.screw pump
B.centrifugal pump
C.eductor
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