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1 (1)
United States
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精选二千七百多条知识,详细全面; 十一大分类,科目清晰,便于查阅; 涵盖各方领域,满足各类疑问需求; 并且新添复制收藏功能,实用方便。
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资料错误了还发出来
「空气为什么不空」在这个类别里写了:为什么空气并不“空“? 在1771年,瑞典药剂师舍勒将一块橡皮似的白磷,扔进一个空瓶子。白磷是个脾气暴躁的家伙,它平白无故就会”发火”一一在空气中自燃。舍勒发现,白磷燃烧之后,瓶子中失去了约1/5的气体,而且小老鼠在剩余的气体中很快死亡。这件事引起了法国化学家拉瓦锡的注意。他进行了详细的研究,最后得出结论:那失去的1/5气体,叫做“氧气”,剩下的是不助燃的”氧气”。现在测定,干燥空气中氧气约占21%,\\\氨气\约占78%\\\,其他气体约占1%。所以空气并不是”空”的。 事实是氮气含量78%,氨气这么高的话人都死了
无知的闲人Sat, Aug 3, 2019
United States
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About
Bundle Id
com.cq.whyKnowlegeMin Os. Version
10.0Release Date
Tue, Sep 15, 2015Update Date
Thu, Jul 16, 2020Content Rating
Has IMessage
NoSupport Watch
NoSupport Siri
NoFile Size
7.01MBHas Game Center
NoFamily Sharing
NoSupport Passbook
NoSupported Languages
ChineseWhat's New
version
1.3updated
3 years ago1、优化界面显示问题 2、修复若干BUG
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