血液由红血球、白血球、血小板和血浆组成。 白血球是我们的战士；我们身体内的军队保护我们免受传染病和侵略者的侵害。白血球占我们总血液的不到 1％。 访问我们的网站 www.fuseschool.org，我们的所有视频都精心组织成主题和具体订单，并了解我们提供的其他内容。评论、点赞并与其他学习者分享。你既可以提问也可以回答问题，老师会尽快回复你。 这些视频可以在翻转的课堂模型中使用，也可以作为修改辅助文件使用。 Twitter：https://twitter.com/fuseSchool 在 fuseSchool 平台和应用程序中获取更深层次的学习体验：www.fuseschool.org 点击这里查看更多视频：https://alugha.com/FuseSchool 此开放式教育资源在知识共享许可协议下免费使用：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
