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问题 单项选择题

轻型井点系统的组成为()。

A.井管、总管、油管、抽水设备

B.滤管、井管、总管、抽水设备

C.总管、滤管、油管、抽水设备

D.滤管、井管、油管、抽水设备

答案

参考答案：B

填空题

根据句意及首字母提示，填写单词。

1. You should s       the bottle (瓶子) before pouring the orange juice.

2. What's your attitude t      what the kids wear to school?

3. Switzerland is the l      of watches, and people there are very serious about time.

4. After exercising in the morning, I usually feel quite r    .

5. Julie k     her mother good night before she went to bed.
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单项选择题 A1型题

下列何种情况不能用χ2检验（）

A.多个均数比较

B.多个率比较

C.构成比比较

D.拟合优度检验

E.关联性分析
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