From these studies, 95% were based on type III or iv evidence (mainly descriptive studies or case reports). Only 3% were based on type II evidence and 2% on type I evidence.
从这些研究中，95%依据第三或第四类论据(主要描述相关研究和病例报道)，只有3%的研究依据第一类论据，2%依据第二类论据。
Certification in wastewater collection and wastewater treatment (level I, II, III or IV depending certification level of the plant) is required for wastewater treatment plant operators.
污水处理厂的运营商要求具备污水收集和污水处理认证(根据工厂认证等级分为i,II,III或IV级)。
9 sample types: type I, type II, III, IV (optional) meet the standard test sample standard processing accuracy requirements.
试样类型：Ⅰ型、Ⅱ型、Ⅲ型、Ⅳ型（选配）符合试验样条标准加工精度要求。
9 sample types: type I, type II, III, IV (optional) meet the standard test sample standard processing accuracy requirements.
试样类型：Ⅰ型、Ⅱ型、Ⅲ型、Ⅳ型（选配）符合试验样条标准加工精度要求。
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