單項(xiàng)選擇題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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1.單項(xiàng)選擇題A tow that veers to the side on the end of the towline is said to（）.

A.yaw
B.surge
C.sway
D.swing

2.單項(xiàng)選擇題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