单项选择题
A tow that veers to the side on the end of the towline is said to（）.
A.yaw
B.surge
C.sway
D.swing
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A tide is called diurnal when（）.
A.only one high and one low water occur during a lunar day
B.the high tide is higher and the low tide is lower than usual
C.the high tide and low tide are exactly six hours apart
D.two high tides occur during a lunar day -
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A strong back refers to a（）.
A.bar securing a cargo port
B.centerline vertical bulkhead
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A stretch where the channel changes from one side of theriver to the other is called a（）.
A.crossing
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