抽取样本时，应注意
A.总体内涵可以模糊
B.研究对象的范围可以模糊
C.样本具有代表性
D.样本容量得当
正确答案是CD
Choose the closest paraphrased version after the following sentence or the italicized part. Blacken the letter corresponding to your choice on the ANSWER SHEET.
One might guess that at this time [when she was studying the poi
