(Polyvinyl Chloride) PVC conforming to ASTM D-1784, Classification 12454-b, formerly designated Type I, Grade 1, is the most frequently specified of all thermoplastic piping materials.
(聚氯乙烯)PV C符合ASTM D - 1784，类别12454 - B标准，以前定义为类别i，等级1，是所有热塑塑料管道材料中应用最广泛的材料。
It could play an important role in grade classification and evaluation of adaptability of all kinds of residential compounds.
对各居民点建设场地适宜性等级划分与评价起到了重要作用。
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