Warning: file_put_contents(/www/wwwroot/ppbbu/4cd.cn/cache/03e02c8c35502b04490e5587de7a3905.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/4cd.cn/index.php on line 55 waterpipe例句_waterpipe英汉例句_waterpipe双解例句_沉淀汉英词典
After analyzing the characteristics and application situation of the polyvinyl chlride waterpipe,the variation of the waterquality in the plastic water pipeis studied. 分析了我國塑料給水琯的特點及應用現狀,對聚氯乙烯塑料給水琯中化學成分對水質的影響進行了研究。