如下图所示探究平面镜成像特点时，将玻璃板作为平面镜竖立在桌上_爱下问搜题

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问题填空题

如下图所示探究平面镜成像特点时，将玻璃板作为平面镜竖立在桌上，通过玻璃板可以看到棋子A的像和棋子B。A的像是因为光通过玻璃射到人眼里形成的，两个棋子大小相同，调整后B能和A的像完全重合说明：，如果把玻璃板竖直向上提一点，B与A的像（选填“仍能”或“不能”）重合。

答案

反像和物是等大的仍能

题目分析：平面镜成像原理是光的反射，所以A的像是光通过玻璃反射到人眼里形成的；平面镜成的像与物体大小相等，把玻璃板竖直向上提，像的位置不变，所以仍能重合。

点评：掌握平面镜成像实验中各器材选择和操作的目的，例如为什么选择薄透明玻璃板、为什么选择两个完全相同的蜡烛、玻璃板为什么要竖直放置、刻度尺的作用等．

阅读理解

阅读理解。

What is recycling? It is to reuse anything that can be used again. Recycling may save our world.
"Recycling" also means doing everything we can do to prevent the need for recycling. How do we do this?
Here are some suggestions:

     ●If you bring your own bags with you to the shop, you won't need to use the bags of the shop.
This will save bags before they need to be recycled.
     ●Don't buy things that can be used only once. For example.use cloth napkins (餐巾) instead of
paper napkins.
    ●Use things that last a long time. For example. use batteries (电池) that can be reused or "long life"
light bulbs (电灯泡). This will make much less litter. There are also many simple ways to save energy.
    ●Dress warmly in the cold season and use less heat. Dress in cool clothes during the warm seasons
and avoid using air conditioners (空调).
     ●Be sure all the windows and doors are closed tightly. This keeps heat or air conditioning in the
room and will save a lot of energy.
     ●Don't leave the fridge door open for a long time!
     ●Turn things off after you use them.
    ●Take showers instead of baths. You use much less water that way. If you take showers, take
shorter ones.

1. "________" is to reuse something that can be used again.
2. What should we take when we go shopping to prevent the need for recycling according to the passage?
    __________________________________________________________
3. 请将画线的英语句子译成汉语。
   __________________________________________________________
4. Why should we take short showers instead of baths?
   __________________________________________________________
5. This passage mainly tells US some _________.

填空题

汽轮机油的循环倍率是指（）每小时的出油量与（）总油之比，应处于（）之间为宜。