发布时间:2025-01-29 21:49:28
pvc溶解力最好是四氢呋喃,其次为环己酮和三氯甲烷。如果是玻纤碳酸钙组成的补强hpvc在这些有机溶剂中的溶胀和溶解性能都会严重变小。
有线电视机顶盒前段时间到期了现在开机显示红灯亮显示4个8是怎么回事
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