四格表χ2检验中χ2<χ20.60(v),可以认为()
A.两样本率不同
B.两样本率相同
C.两总体率不同
D.两总体率相同
E.不能确定
参考答案:D
劳动组织内容的核心是劳动协作和分工。
—What did you do yesterday?
—My brother took two friends of ________ to play chess with us. But I don’t’ know _______ of them.
A.his, all
B.him, both
C.him, either
D.his, either