Definition of inlet velocity of tube well for water supply and its calculation 供水管井进水流速的定义及其计算上
2.
Well screens and casings of unplasticized polyvinylchloride for tube well - part 3 : dn 250 to dn 400 with trapezoidal thread 管井用未增塑聚氯乙烯井滤网和铸件.第3部分:带梯形螺
3.
Well screens and casings of unplasticized polyvinylchloride for tube wells - part 2 : dn 100 to dn 200 with trapezoidal thread 管井用未增塑聚氯乙烯过滤管网和管套.第2部分:带梯形
4.
Well screens and casings of unplasticized polyvinylchloride for tube wells - part 1 : dn 35 to dn 100 with whitworth - pipe thread 管井用未增塑聚氯乙烯井滤网和铸件.第1部分:带惠氏标
