单选题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?（）.AGun tackleBLuff tackleCTwo-fold tackleDDouble-luff tackle
单选题
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
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