鉴别急、慢性肾衰竭最重要的检查指标是（）
A.贫血
B.肾脏大小
C.血肌酐
D.尿素氮
E.尿量
参考答案：B
下列常见物质中，属于纯净物的是（ ）
A．蒸馏水
B．白酒
C．酱油
D．食醋
Mr Smith, I often hear people say IOC, would you please tell me what IOC _____? [ ]
A. acts as
B. prefers to
C. stands for
D. points to
