4000B 系列减压阀组件可防止由于反虹吸和/或背压而导致的污水反向流入饮用水供应。它由青铜阀体结构、两个直列式独立止回阀、带中间溢流阀的可更换止回阀座和球阀测试旋塞组成。4000B 系列是保护健康危害交叉连接或密封服务管线入口处的理想选择。。最大工作压力:175psi(1
The most comprehensive database of Chinese poetry 🧶最全中华古诗词数据库, 唐宋两朝近一万四千古诗人, 接近5.5万首唐诗加26万宋诗. 两宋时期1564位词人,21050首词。 - chinese-poetry/json/poet.tang.4000.json at f2ee5de9f7d913c71aa718b295c249b4838383d1 ·
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