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（）.

单项选择题 Manila slings should not be used to load（）.

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（）.