单项选择题
A.Towing alongside B.Towing astern C.Holding knots and splices D.Resisting damage from chemicals
Neglecting friction，you desire to lift a 300 kgs weight...
单项选择题Neglecting friction，you desire to lift a 300 kgs weight with a stress on the hauling part of 100 kgs.Which of the following tackles would you use（）.
A.Gun tackle B.Luff tackle C.Two-fold tackle D.Double-luff tackle
Manila slings should not be used to load（）.A.cottonB.lu...
单项选择题Manila slings should not be used to load（）.
A.cotton B.lumber C.steel D.tires
Instead of whipping an end of a line，a temporary means ...
单项选择题Instead of whipping an end of a line，a temporary means of preventing the line from unraveling is to tie a（）.
A.becket bend B.blackwall hitch C.figure-eight knot D.square knot
