单选题What happens to the pulling power of a winch when retrieving wire rope?（）AIt increasesBIt decreasesCIt remains the sameDIt fluctuates，depending on the gearing system
单选题
What happens to the pulling power of a winch when retrieving wire rope?（）
A
It increases
B
It decreases
C
It remains the same
D
It fluctuates，depending on the gearing system
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解析：
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