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

单项选择题The distance that a vessel travels from the time that the order to put engines full astern until the vessel is dead in the water is known as（）.

A.advance
B.head reach
C.surge
D.transfer

单项选择题The condition where a ship on the end of a tow line is riding a wave crest at the same time as its tug rides a wave crest is known as riding in（）.

A.synchronism
B.harmony
C.check
D.step

单项选择题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

单项选择题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

单项选择题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