诊断泌尿系统疾病首选的检查项目是() A: 内生肌酐清除率CAAIOTCVPMJXWIDJHVNG B: 血尿素氮CAAIOTCVPMJXWIDJHVNGBXLGDH C: 血清肌酐CAAIOTCVPMJXWIDJHVNGBXLGDH D: 尿浓缩稀释试验CAAIOTCVPMJXWIDJHVNG E: 尿常规检查CAAIOTCVPMJXWIDJHVNGBXLG