1820年,法国人N民埃普斯找到了一种纯感光的材料,下列哪些不是()A、白沥青 B、

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问题:

1820年,法国人N民埃普斯找到了一种纯感光的材料,下列哪些不是()

A、白沥青

B、荧光

C、石灰石

D、玻璃

考点:经济学基础摄影基础摄影题库
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(3分)下图表示洋葱鳞片叶表皮细胞临时装片制作以及用显微镜观察的部分步骤,请据图回答。

(1)②是盖盖玻片操作。正确的方法是:用镊子夹起盖玻片,使它的一边先接触载玻片上的水滴,然后缓缓放下。这样做可以避免盖玻片下面出现           ,而影响观察。

(2)③是表示染色的过程,染色用的液体是                 。

(3)用显微镜观察洋葱鳞片叶的表皮细胞第一次看到的物像如⑤所示,应将装片向            移动后才能达到⑥的效果。

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阅读理解

     What's your favorite weather? Do you like sunny or rainy days? Many people like sunny days a lot. They

don't like rain. They think rain makes them feel sad. During a long vacation, they like going to the beach to

enjoy the sunshine(阳光).Sunshine makes them feel very good and happy.

     I like sunshine very much, but I also enjoy rain. I enjoy the sound (声音)of rain. It makes me feel quiet. On

rainy days, I like listening to music and reading books, or just looking at the rain and daydreaming(做白日梦).

When you daydream, you don't think about other things. I think it's a good way to relax when it rains.

     Sunshine can make one run around and rain can make one quiet, so I hope you can feel happy, rain or sunshine.

1.Many people don't like rain because it makes them feel ______.

A. happy

B. sad

C. tired

D. relaxing

2.The writer enjoys the sound of ______.

A. rain

B. snow

C. wind

D. cloud

3.We don't think about other things when we ______.

A. sing

B. dance

C. daydream

D. shop

4.Sunshine can make people ______.

A. quiet

B. run around

C. relaxed

D. sad

5.The writer thinks daydreaming is a good way to relax when it ______.

A. snows

B. shines

C. rains

D. winds

题型:多项选择题

“好雨知时节,当春乃发生.随风潜入夜,润物细无声”中主要描写了哪种环境因素(  )

A.光

B.水

C.空气

D.土壤

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传动螺纹多用()螺纹。

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普查指导员和普查员的主要职责是什么?

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