which scientist discovered that objects in water are lifted up by a force that helps them float?

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• Which scientist discovered that objects in water are lifted up by a force that helps them float
• Which scientist discovered that objects in water are lifted up by a force that helps them float这句话中的两个 that 的含义和区别
• which scientist discovered that objects in water are lifted up by a force that helps them float?可以帮我翻译一下吗?谢谢了~
• 一些外国科学家名字用英文写名字:1.which scientist discovered that objects in water are lifted up by a force that help them float?2.who wrote a book explaining how animals and plants developed as the environment changed?3.who invented the first steam engine?4.who used peas to show how physical characteristics are passed from parents to their children?5.居里夫妇6.who invented the way of giving electricity to everybody in large cities?7.who was the painter that studied dead
• which scientist discovered that objects in water are lifted up by a force that helps them float?
• 有谁知道他们发明者的英文名字啊````Which scientist discovered that objects in water are lifted up by a force that helps them float?Who used peas to show how physical characteristics are passed from parents to their children?Who was the painter that studied dead bodies to improve his painting of people?Who invented a lamp to keep miners safe underground?
• 求英语作文.“给你的外国朋友发一封E-mail,向他介绍你的大学生活”
• 小军上山的速度是每小时8千米,用了三十分钟,下山的速度是每小时12千米,上山与下山的平均速度