单项选择题
A.the eye of the second line is dipped B.the mooring lines are doubled C.the bollard has two horns D.one of the lines is a breast line
Tugs sometimes shackle a length of chain in the towline...
单项选择题Tugs sometimes shackle a length of chain in the towline in order to（）.
A.take the wear should the towline drag bottom B.assure that if the towline is overstressed it will part close to the bridle C.prevent the towline from whipping should it part D.put spring in the towline
Towlines should be inspected for chafing where the towl...
单项选择题Towlines should be inspected for chafing where the towline（）.
A.passes over the stern of the towing vessel B.passes through chocks C.is attached to the disabled vessel D.All of the above
The strongest of the natural fibers is（）.A.cottonB.hemp...
单项选择题The strongest of the natural fibers is（）.
A.cotton B.hemp C.manila D.sisal
