基本解释[能源科学技术]回流管英汉例句双语例句Watts Dual Check Backflow Preventers can be specified in many different combinations of connection types, sizes, and union options.美国瓦茨双止回防回流阀可以按照连接类型、通径和接头构成许多不同的组合。backflow connection更多例句词组短语短语backflow w connection 回流管Connection backflow 回流连接backflow connection更多词组专业释义能源科学技术回流管