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问题 单项选择题 A1型题

R×C表中多个样本率比较的χ2检验，若P<0.01，说明（）

A.每两个样本率之间不相等

B.每两个总体率之间不相等

C.多个样本率之间不等或不全等

D.一定有两个总体率之间相等

E.多个总体率之间不等或不全等

答案

参考答案：E

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现有下列命题：①幂函数的图象都经过点（1，1）和点（0，0）；②幂函数的图象不可能在第四象限；③当n=0时，函数y=xn的图象是一条直线；④幂函数y=xn，当n＞0时是增函数；⑤幂函数y=xn，当n＜0时，在第一象限内函数值随x值的增大而减小．其中正确命题的序号是：______．把你认为正确的命题的序号都填上）．
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根据句意及首字母提示完成单词。

1. Every driver must obey the traffic r_______. Because it's good for himself and others.

2. Don't f_______ with each other. It's dangerous.

3. If you want to do some exercise. you'd better wear s_______.

4. I know he is a famous a_______

5. The flowers on the hills in spring are c_______.

6. What do you think of f_______?

7. Sorry, I don't really a_______ with you.

8. The b_______ of the story is like this:long, long ago …

9. That old man often r_______ under the tree.

10. R_______ to bring your school things here.

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