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问题 选择题

如图所示的电路中，闭合开关S后，电流表A1的示数为I1大于电流表A2的示数为I2 ；若将它们改为串联电路，则通过两灯的电流，下列判断正确的是：

[ ]

A．通过L1的电流大

B．通过L2的电流大

C．两灯的电流一样大

D．无法确定

答案

答案：C

填空题

根据句意和汉语提示写出单词的正确形式。

1. In the afternoon they went to all exhibition of ________ (现代) art.

2. A man from Canada spent a summer in our ________ (村子).

3. Most of them were surprised to hear my ________ (决定).

4. — When did Columbus ________ (发现) America?

    — In 1492.

5. Children of all ages should be outdoors ________ (几个) hours a day.

6. People think it is ________ (无礼) to talk loudly in public places.

7. Never ________ (争吵) with your parents or teachers. Be polite to them.

8. The girl felt nervous ________ (尤其) when the teacher asked her questions.

9. I think kids should learn to plan things for ________ (自己).

10. Wang Lin has a ________ (俄罗斯) pen pal, and my pen pal is from Australia.

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单项选择题

城市热力管道在零度以下的气温中焊接，应在焊口两侧()mm范围内对焊件进行预热。

A.40

B.50

C.60

D.30
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