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初中英语听力短文含原文 mp3格式音频文件翻译

02月19日 编辑 39baobao.com

[初中生背诵的英语小短文孩子上初一现在放假了想提高一下英语成]One morning a countryman went to his goose's nest, and saw a yellow and glittering egg there。 He took the egg home。 To his delight, he found that it was an eg...+阅读

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当光敏二极管处在反向连接时,即万用表红表笔接光敏二极管正极,黑表笔接光敏二极管负极,此时电阻应接近无穷大(无光照射时),当用光照射到光敏二极管上时,万用表的表针应大幅度问右偏转,当光很强时,表针会打到0刻度右边。

当测量带环极的光敏二极管时,环极和后极(正极)也相当一个光敏二极管,其性能也具有单向导电作用和见光后反向电阻大大下降。

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