Polyvinyl chloride (PVC) is a kind of general colophony.
聚氯乙烯(polyvinyl chloride,PVC)是一种通用树脂。
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交通运输工程
树脂
Besides,this article analyzes many new material used in the no gravel orbit construction such as passenger transportation special line bifucation ,fastener and epoxy colophony eluting steel bar.