作出图中物体通过平面镜所成的像．

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问题问答题

作出图中物体通过平面镜所成的像．

答案

先根据像与物关于平面镜对称作出端点A、B在平面镜中的像点A′、B′，用虚线连接A′、B′即为物体AB在平面镜中所成的像，如图所示：

填空题

根据句意和首字母或汉语提示写出句中所缺单词，每空一词。

1. Zhijin Cave is known as the most beautiful underground _______ (宫殿) in the world.

2. Susan usually has some pieces of b_______ and a bottle of milk for breakfast.

3. In English the first name is the g_______ name.

4. Spring is the best time for p_______ trees.

5. — Excuse me. Are you f_______ now?

— Sorry, I'm very busy.

6. It's ten _______ (分钟) walk.

7. He _______ (使用) a lift to go up and down every day.

8. Food must be _______ (保存) in cool places in summer.

9. We often listen to our teacher _______ (认真) in class.

10. With the d_______ of computer science, more and more work will be done by computer.

问答题简答题

工艺反应2P605电机无法起动（接触器未吸合），电气人员将该抽屉柜在试验位置做试验接触器能吸合但无法自保持。请你判断故障的可能原因。