美国瓦茨NLF9是一种具有专利技术的反虹吸防回流阀，特别适用于可连接移动式软管的实验室水龙头。
Watts NLF9 is a patented backsiphonage preventer specially made for laboratory faucets where portable hoses can be attached.
通过实验结果分析，初步得出对地埋软管供水技术影响的几个重要参数及优化组合。
Through anglicizing to the test results, we have found several important parameters and some optimized parameter configures that is vital to the practical work.
实验分析可以包含多达2000支软管和四条标准曲线，每个可包含高达24个值。
Assays may include up to 2000 tubes and up to four standard curves, each of which can incorporate up to 24 values.
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