配平下列反应的化学方程式：（1）_______NH3+______Cl2--_

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问题填空题

配平下列反应的化学方程式：

（1）_______NH₃+______Cl₂--______N₂+_______HCl

（2）_____C₂H₂+______O₂--________CO₂+______H₂O

（3）______Fe₂O₃+______CO--________Fe+_______CO₂

答案

(1)2NH₃+3Cl₂==N₂+6HCl

(2)2C₂H₂+ 5O₂4CO₂+2H₂O

(3)Fe₂O₃+3CO2Fe+3CO₂

阅读理解

阅读理解。

I have seven bags. Three bags are big, and the other four bags are small.I have some basketballs

and volleyballs. I put two volleyballs in each (每一个) small bag. And I put two basketballs and two

volleyballs in each big bag.The number of the volleyballs is my age (年龄).

1.I have ______ volleyballs.

A. three

B. five

C. fourteen

D. seven

2. I have ______ basketballs.

A. six

B. eight

C. ten

D. twelve

3. What's in those big bags?

A. Two basketballs and six volleyballs.

B. Eight basketballs and six volleyballs.

C. Six basketballs and six volleyballs.

D. Eight basketballs and eight volleyballs.

4.Where are the basketballs?

A. In the big bags.

B. In the small bags.

C. In a big bag.

D. In a small bag.

5. How old am I?

A. I am six.

B. I'm twelve.

C. I'm fourteen.

D. I am sixteen.

单项选择题

当前能连接CPU、内存、输入输出设备控制器等部件，并使它们组成一个可扩充的计算机系统的总线称为( )。

A．SCSI

B．内部总线

C．系统总线

D．IDE总线