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现在很多孩子背的书包都是塑料的，一般都是PVC材质的。 PVC是世界上最早、应用最广泛的通用热塑性塑料。

California’s proposal No. 65 (caprop65, safe drinking water and Toxic Enforcement Act of 1986) has become a widely used reference standard for the control of toxic and hazardous substances in the United States since its implementation. So far, the products in the California 65 act litigation include handbags, wallets, shoes, belts, clothing, fashion accessories, jewelry, […]