鑄鐵排水管B型配(pei)件斜三通 采用順水(shui)(shui)三(san)通(tong)或順水(shui)(shui)四(si)通(tong)和45°斜通(tong)或45°斜四(si)通(tong)”,現在(zai)還有(you)旋(xuan)流三(san)通(tong)和旋(xuan)流四(si)通(tong),排水(shui)(shui)和通(tong)氣(qi)效(xiao)果(guo)比順水(shui)(shui)、比45°斜要好上面的管件(jian)有(you)了變化,下(xia)面的管件(jian)也有(you)變化