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弯头的长度计算公式怎么算_家居日记
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弯头的长度计算公式怎么算

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弯头的长度计算公式怎么算 以90°和45°的弯头为例，90°弯头的长度(㎜)=R*1.57（弯曲半du径单位㎜）2）；90°弯头所需料(M)=直径*2.5*所需


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