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最佳答案:看8号图纸上孔的尺寸和要求
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最佳答案:Machine with 2 layers of the split flange insulation pads,adhesive layer has bee
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最佳答案:管套 pipe sleeve正三通 Tee管帽 pipe cap90弯头 normal bend截止阀 stop valve异径管套 reduced pipe
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最佳答案:Member of the college DE France, French contemporary philosopher michel Selma ev
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最佳答案:Air hose plate splicing nips the mouth seam to be supposed to stagger,must not h