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垫片哪一面朝着螺母_家居日记
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垫片哪一面朝着螺母

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垫片哪一面朝着螺母 垫片光滑的一面是朝着螺母的，这个面要比另一面更光滑，其摩擦力也较小小，这时候螺母在拧紧、松开等转动过程中，就不会带动垫片一起运转，可以尽可能


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