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问题 单项选择题

在体积为VL的密闭容器中有amolNO和bmolO2，待反应后容器内氮原子数和氧原子数之比为（）。

A.

B.

C.

D.

答案

参考答案：D

解析：

根据N、O原子在反应中守恒可知，反应后容器内氮原子数和氧原子数之比为

句型转换

按要求变化下列各句。

1. "Are they going to Hong Kong?" Lucy asked me. (改为直接引语)

    Lucy asked me if __________.

2. I have lived in Shanghai since I was born. (对画线部分提问)

    ________ have you lived in Shanghai?

3. Xiao Li's father has already finished reading the book. (改为否定句)

    Xiao Li's father __________ finished reading the book __________.

4. Millions of people all over the world enjoy Disneyland. (改为被动语态)

   Disneyland ______________ millions of people all over the world.

5. Kate has had the silk hat for three years. (改为一般过去时)

    Kate _____ the silk hat three years _________.

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单项选择题

酸性液压送罐压液时，应先（）。

A、打开压液阀

B、打开氮气阀

C、关闭气相返回阀

D、关闭液相进口阀
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