提示早期肾功能不全的内生肌酐清除率
A.70~51ml/分B.50~31ml/分C.30~21ml/分D.20~1lml/分E.10~6ml/分
参考答案:D
This is not _________ pen.[ ]
A. she
B. her
C. him
D. he
问卷太长会影响填答,最好在30min以上。( )