單項(xiàng)選擇題The effect known as bank cushion acts in which of the following ways on a single-screw vessel proceeding along a narrow channel? ()

A.It forces the bow away from the bank
B.It forces the stern away from the bank
C.It forces the entire vessel away from the bank
D.It heels the vessel toward the bank


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3.單項(xiàng)選擇題The catenary().

A.acts as a reserve length of towing hawser when the tug applies more power,and it dampens the surge effect of the tow
B.gives an approximation of the amount of strain on the towing hawser
C.is the dip in the towing hawser between the tug and the tow
D.All of the above

4.單項(xiàng)選擇題The biggest problem you generally encounter while towing a single tow astern is().

A.the catenary dragging on the bottom
B.swamping of the tow
C.the tow tending to dive
D.yaw

5.單項(xiàng)選擇題The best method to secure a tow line to a cleat is to().

A.take a turn around the cleat,then figure-eights,and a half-hitch
B.make figure-eights,followed by a half-hitch,then a figure-eight knot
C.take a turn,a half turn,and a figure-eight
D.take several turns around the cleat only