单项选择题
A.have equal legs of sufficient length
B.have a large angle between the legs
C.be formed on a bight of cable through a ring
D.never be made up of chain
单项选择题 A tow bridle is attached to the main tow hawser at the（）.
单项选择题 A term used to describe the dip in a towline that acts as a shock absorber is（）.
单项选择题 A solution to overcome tripping defects is an arrangement of special plates on either side of the flukes，designed to set them in the correct tripping position. These special plates are called（）.