在示波管中，电子枪2秒内发射了6×10¹³个电子，则示波管中电流强度的大小为 （  ）

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                                                                                               中国瓷器
      ①中国瓷器是世界公认的伟大发明之一。它之所以名扬天下，主要在于其本身所包含的三项独创技术：胎质、瓷釉、烧结火候。
      ②中国瓷器的胎质大多具备一定的透明性，所谓有素肌玉骨之像。它的原料多为高岭土，无论东南沿海还是华中各省都有此土，尤其是在江西景德镇高岭村一带，风化了的白云母花岗岩蓄藏丰厚。也就是说，在中华大地取用制瓷原料是得天独厚的。
      ③瓷釉覆盖在瓷胎上，实际上就形成了一种复合材料。宋代以后，景德镇成为瓷业的主要生产地之一，就是因为这一带开始以“白云石”加入釉中，使瓷釉洁白又易于施加彩饰。
      ④烧结火候，主要是指瓷器烧成的温度。烧制陶器、砖瓦都在1000℃以下，瓷器则不然。据推测，早期瓷器的烧成温度就已经达到1200℃了。日本大阪大学美术史教授木村重信先生曾撰文：“尽管要通过1300℃高温煅烧，釉料仍不变色，纹样依然如故，这就是中国瓷器烧制技术上关键的秘密所在。”
      ⑤中国瓷器享誉世界，也在于它是科学技术与民间工艺美术技法完美结合的产物。传统细瓷早已形成一整套美化装饰的方式方法，不管是刻花、剔花，还是贴花、印花；也不管是堆雕、镂雕，还是镏金、戗金……均极尽缤纷艳丽，堪称巧夺天工。早期的纹饰简单、自然，完全由烧瓷艺人自行设计，例如水纹、云纹、花纹和兽纹等。盛唐以来，纹饰大量借鉴金属器皿、各种织物等图案，使瓷器的装饰意味更浓。宋代以后，瓷业工艺技法愈加精细，彩绘画面也刻意追寻名画师的笔意，有的春花烂漫，有的冬雪裹枝，有的高山流水，有的繁星满天……这无不增添了瓷器美的意蕴，
      ⑥中国瓷器还承载着丰厚的文化积淀。它的彩绘内容有来自民间传说、历史故事，也有“犀牛望月”、“龙凤吉祥”、“岁寒三友”等寓意丰富的图案。康熙年间，景德镇窑曾经烧制一组花卉瓷酒盅，薄胎青花，加彩题句，一盅一花一词。其中梅花盅题为“素艳雪凝树，清香风满枝”；杏花盅题为“青香和宿雨，佳色出晴烟”；桃花盅则题为“风花新社燕，时节归春浓”……瓷精，图美，词句优雅，在有限的空间中令人感受到无限的韵味。
      ⑦中国瓷器，实在是令人叹为观止。

    What is the easiest way to stay warm in the super cold?____. At least that is what Santa Claus told me.

    During Christmas, Dennis and I went to Finland. We brought back some tips for keeping warm in a cold temperature.

    ⒈There layers(层)work wonders.

    Start with the base layer, which sits right on your skin: choose something that can absorb sweat____A sweater is a good choice. The most important layer is the outer clothes, which should be waterproof(防水的)and windproof.

    ⒉____.

    You lose heat from every millimeter of uncovered skin, which was the biggest lesson I learned on this trip. My whole body was well covered. But I missed one sport: my face. So it often felt like the wind was going to blow my nose off.

    ⒊Exercise, don't just stand still.

    When it's cold, exercising may be the last thing you feel like doing, but be smart.____and you will feel the difference. When we first got to Finland, we were freezing. But after a couple of minutes jumping around, we felt less cold.

    ⒋If you have a heater

    You may want to turn it all the way up, but it's best to keep it at between 18 and 20 degrees____but not create a huge difference between inside and outside.

A. Grow a crazy beard.

B. The key is what your layer is

C. Cover every bit of your skin

D. That will keep you comfortable

E. Take a walk, faster than your normal speed

F. Don't forget to keep your hands and feet warm, too

G. The middle layer keeps your body heat from getting away