Whiworth screw pitch的意思|示意
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惠沃斯螺距
Whiworth screw pitch的网络常见释义
惠氏螺距 ... international screw pitch gauge 国际螺距规 Whiworth screw pitch 惠氏螺距 screw pitch gauge 螺距规 ; 螺旋副计量器具 ...