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问题 选择题

下列说法正确的是（　　）

A．工业上用C还原Al2O3产生Al

B．氯水能使红色花瓣褪色

C．常温下，硅与浓HNO3反应放出NO2

D．Fe（OH）2溶于NaOH溶液

答案

答案：B

填空题

根据句意及首字母提示填写单词，使句子完整。

1. K_______ are used for cutting things.

2. The table is dirty. Would you please w_______ it for me?

3. —Would you like another cake?  

   —No, thanks. I am f_______ .

4.  You are supposed to eat soup with a s________.

5. It's not right to spit in public. It's bad m________ .
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问答题 简答题

随动系统不准确度的含义是什么？
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