认识周期表中的周期和族。可以用两种方式，即族和周期对周期表中的元素进行细分。如何区别呢？又与周期表的发展有何关系？从这个视频了解更多。 请访问我们的网站 www.fuseschool.org，我们所有的视频都按主题和特定的顺序精心编排，并查看我们还提供了什么。评论、喜欢并与其他学习者分享。你可以提问，也可以回答问题，老师会给你回复。 这些视频可以用于翻转课堂模式，也可以作为复习辅助工具。 点击这里查看更多视频：https://alugha.com/FuseSchool Twitter: https://twitter.com/fuseSchool 在FuseSchool平台和应用中获得更深层次的学习体验：www.fuseschool.org。 本开放教育资源是免费的，采用知识共享许可证。署名-非商业性 CC BY-NC ( 查看许可证契约: http://creativecommons.org/licenses/by-nc/4.0/ )。 你可以下载该视频用于非营利性的教育用途。如果你想修改视频，请联系我们：info@fuseschool.org。
Interest is the amount charged by a lender to a borrower. It means that if you borrow some money from a bank, you have to pay back more than the money you borrowed. Equally, if you have a savings account and deposit some money, the bank will pay you interest as a sort of thank you for saving with th
In this video we are going to look at a few different ways in which plant hormones can be used. Plant growth hormones (auxins) can be used as selective weedkillers. The selective weedkillers contain growth hormones, that cause the weeds to grow really quickly. This means the weed is absorbing nutr
Algebraic fractions are simply fractions with algebraic expressions either on the top, bottom or both. We treat them in the same way as we would numerical fractions. In this video we look at how to simplify algebraic fractions, and how to add and subtract them. VISIT us at www.fuseschool.org, wh
