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I'm self-learning Linear Algebra and have been trying to take a geometric approach to understand what matrices mean visually I've noticed this matrix product pop up repeatedly and can't seem to de
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千焦和千卡的换算关系是：1000千焦=238 9大卡，1 大卡（千卡）=4 18千焦（KJ），一般千焦换算成大卡可以直接除以4 18来计算如果要粗略计算热量，直接除以4即可。
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有问题，上知乎。知乎，可信赖的问答社区，以让每个人高效获得可信赖的解答为使命。知乎凭借认真、专业和友善的社区氛围，结构化、易获得的优质内容，基于问答的内容生产方式和独特的社区机制，吸引、聚集了各行各业中大量的亲历者、内行人、领域专家、领域爱好者，将高质量的内容透过
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Possible Duplicate: How do I convince someone that $1+1=2$ may not necessarily be true? I once read that some mathematicians provided a very length proof of $1+1=2$ Can you think of some way to
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- 知乎 - 有问题，就会有答案
知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。
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空调制冷+制热全年耗电量相差794-636=158度电 总结 海尔1 5匹空调，一级比三级年省电159度电 格力1 5匹空调，一级比三级年省电158度电 购买建议：空调使用寿命基本在5~10年，如果你在北方，空调使用少，每年只在夏季开2~3个月空调，这期间总耗电量大约相差1000度。
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