滤过膜的特点有（）
A.与血液生物相容性好
B.截留分子量明确
C.高滤过率
D.不易吸收蛋白
E.物理性能高度稳定
参考答案：A, B, C, D, E
My mother suggested that not only ______ study hard myself but also _____help my sister. [ ]
A. I should; I should
B. should I; should I
C. should I; I should
D. I should; should I
人民警察集体奖励的对象只能是各级公安机关建制单位。( )
