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【单选题】
,30岁。反复发作尿频,右侧腰痛2年,近月来发作2次,并伴血尿。尿沉渣发现革兰阴性杆菌。为对因治疗,首先应做的检查是A.
尿比重检查
B.
内生肌酐清除率测定
C.
酚红排泄试验
D.
静脉肾盂造影
E.
尿结核杆菌培养
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