单项选择题
A towboat has the same draft as the barges it is pushing ahead. If the distance from the stern of the towboat to the head of the tow is 260m，where is the approximate location of the pivot point of the unit?（）
A.At the head of the tow
B.75m from the head of the tow
C.120m from the head of the tow
D.180m from the head of the tow
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A tow that veers to the side on the end of the towline is said to（）.
A.yaw
B.surge
C.sway
D.swing -
单项选择题
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
C.deep beam
D.spanner stay
