(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ASTMD- 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。
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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