师傅老周戴上白手套,从产线上随手抽出一根镀锌管,游标卡尺一夹,壁厚卡在1.8mm,头也没抬:“比国标多了两丝。别看这两丝,锈穿的年限能差出七八年。”车间里切管机的尖啸声一停,老周又把卡尺举到我眼前,刻度那两道细痕明晃晃的。...
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