有两个高度相同的螺钉螺纹越密的螺钉越省力省力 这是由于螺钉的螺纹越密相当于增加了斜面的长度在高度一定时越省力螺钉的螺纹越密相当于增加 Template




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tomski有两个高度相同的螺钉螺纹越密的螺钉越省力省力 这是由于螺钉的螺纹越密相当于增加了斜面的长度在高度一定时越省力螺钉的螺纹越密相当于增加 coloring