The presence of co-existing or additional diseases with reference to an initial diagnosis or with reference to the index condition that is the subject of study.
共病是指相对于原始诊断或相对于研究主题所指病情而言，共同存在或附加的疾病。
The influence of various corrosion elements are analyzed in detail and mechanism of corrosion of softening water is expounded according to the quality index condition of recycling softening water.
根据循环软化水水质指标现状，详尽分析了各种腐蚀因素的影响，论述了软化水的腐蚀机理。
The influence of various corrosion elements are analyzed in detail and mechanism of corrosion of softening water is expounded according to the quality index condition of recycling softening water.
根据循环软化水水质指标现状，详尽分析了各种腐蚀因素的影响，论述了软化水的腐蚀机理。
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