小华学了功率知识后，想测出自己正常上楼的功率． （1）该实验的原理是______

用所给单词的适当形式填空。

1. My brother is two years _____________ (old) than me.

2. Tom is as _____________ (fat) as Jim.

3. Who is _____________ (thin), you or Helen?  Helen is.

4. Does Nancy sing _____________ (well) than Helen?  Yes, she does.

5. Which is _____________ (heavy), the elephant or the pig?

6. Whose pencil-box is _____________ (big), yours or hers?  Hers is.

7. You have seven books, but I have _____________ (many) than you. I have ten.

8. I jump _____________ (far) than some of the boys in my class.

9. I'm very tall, but she's _____________ (tall) than me.

10. It gets _____________ and _____________ (warm) when spring comes.

下列各种说法中正确的是（　　）

A．

检验氧气是否充满

B．

盛有的CO₂集气瓶

C．

氢气还原氧化铜

D．

过滤

慢性支气管炎的缓解期，时间应是（）

A.1个月以内

B.1个月以上

C.2个月以内

D.2个月以上

E.3个月以内

变压器气体继电器试验应具备的节点，下列选项正确的是（）。

A.两付重瓦斯接点

B.一付重瓦斯接点

C.两付轻瓦斯接点

D.一付轻瓦斯接点

消费与经营者发生消费纠纷时，可以通过哪些途径解决？