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问题 单项选择题

在统计分析中，为了使显著性检验的两类错误同时减少，可采取何种措施（）

A.增加人员和设备

B.降低实验误差

C.增加样本含量

D.提高显著性水平

E.降低系统误差

答案

参考答案：C

选择题

下列计算正确的是（　　）

A．-3+2=1

B．2×（-5）=-10

C．|-3|=-3

D．20=0
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填空题

根据首字母和汉语提示完成单词。

1.That musician has w______  many songs?

2.—Has your father been a______?

   —Yes, he has been to many countries.?

3. Zhang Ziyi is very famous.He Meifeng has always wanted to m______her?

4. How many tickets can you buy if they are all s______  out?

5. Wei Ming's father is an Air China captain, so he has f______  to many different countries.
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