质量守恒定律 自然界的基本定律之一 law of conservation of mass 质量守恒定律一般指物质守恒定律（自然界的基本定律之一） Law of conservation of mass generally refers to the law of conservation of matter (one of the fundamental laws of nature) 拉瓦锡， 现代化学之父 Lavoisier ...
It is probably the most famous mathematical theorerm in the world There have been a lot of important math theorems over time and you’ve probably learned your fair share of them. If you’ve had a traditional education, then you’re going to learn about math theorems. Which ...
HE FAMOUSLY SAID THAT HE COULD TOPPLE THE EARTH IF GIVEN AN APT PLACE TO STAND ON A lever is a machine consisting of a rigid rod pivoted at a fixed hinge, or fulcrum. In his book On the Equilibrium of Planes , Archimedes proved the law of the lever using geom ...
What If Every Electron Is the Same Electron ? A vaguely plausible thought experiment posits that every electron is one electron moving back and forth through time. 如果每个电子都是同一个电子呢？ 一个貌似合理的思想实验假设每个电子都是一个在时间中来回移动的电子。 Here& ...
质量守恒定律 自然界的基本定律之一 【配精美图片】
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