一个零件形状如图所示,按规定当∠A=90°,∠B=29°,∠C=21°时,检验人员量得∠BDC=141°就断定不合格?Why?
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![一个零件形状如图所示,按规定当∠A=90°,∠B=29°,∠C=21°时,检验人员量得∠BDC=141°就断定不合格?Why?](/uploads/image/z/2725566-6-6.jpg?t=%E4%B8%80%E4%B8%AA%E9%9B%B6%E4%BB%B6%E5%BD%A2%E7%8A%B6%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E6%8C%89%E8%A7%84%E5%AE%9A%E5%BD%93%E2%88%A0A%3D90%C2%B0%2C%E2%88%A0B%3D29%C2%B0%2C%E2%88%A0C%3D21%C2%B0%E6%97%B6%2C%E6%A3%80%E9%AA%8C%E4%BA%BA%E5%91%98%E9%87%8F%E5%BE%97%E2%88%A0BDC%3D141%C2%B0%E5%B0%B1%E6%96%AD%E5%AE%9A%E4%B8%8D%E5%90%88%E6%A0%BC%3FWhy%3F)
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