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
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A.taut and leading forward
B.slack
C.leading out perpendicular to the centerline
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单项选择题
A deepwell pump is a type of（）.
A.screw pump
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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
