下列肾功能监测的指标中,临床很少应用的是()
A.肾小球滤过率(GFR)
B.血尿素氮(BUN)
C.血肌酐(Cr)
D.肾血流量测定
E.肾小管功能测定
参考答案:D
将下列句子改为复数形式。
1. This is a girl student.
______ are girl ______.
2. That is a dictionary.
______ are ______.
3. Is it a watch?
______ they ______?
4. This isn't her backpack.
______ ______ her backpacks.
5. Who is your friend?
Who ______ your ______?
各种抽样方法的抽样误差一般是( )
A.整群抽样>单纯随机抽样>系统抽样>分层抽样B.整群抽样<单纯随机抽样<系统抽样<分层抽样C.整群抽样≥单纯随机抽样≥系统抽样≥分层抽样D.整群抽样≤单纯随机抽样≤系统抽样≤分层抽样