schedule 40与schedule 80 pvc电气导管有什么区别?
pvc穿线管标准小编张建峰为您诠释
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pvc给水管的规格尺寸有Φ20-Φ25-Φ32-Φ40-Φ50-Φ63-Φ75-Φ90-Φ
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