整群抽样
参考答案:
这种从总体中随机抽取一些小的群体,由所抽出的小群体内的所有单位构成调查样本的抽样方法。
-It’s my treat today. Is there any particular meal you would like to have?
- you choose is all right with me.
A.Whatever
B.What
C.Anything what
D.No matter what
足月儿生理性黄疸( )。
A.血清胆红素≥85/2μmol/LB.血清胆红素≤171μmol/LC.血清胆红素≤205μmol/LD.血清胆红素>256.5μmol/LE.血清胆红素>342μmol/L