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19259 train running status: To make sure you’re getting the directions
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To make sure you’re getting the directions for your account, select from the options below. Learn more about YouTube YouTube help videos Browse our video library for helpful tips, feature overviews, and step-by-step tutorials. YouTube Known Issues Get information on reported technical issues or scheduled maintenance. Download the YouTube app for a richer viewing experience on your smartphone. 为什么Born-Oppenheimer近似又被称为绝热近似？ 如题。 热力学中绝热近似就是指系统和外界无热交换，那么这里呢？ 该假设下原子核近似为不动，近似为简谐振动（这又为啥？ ），但似乎没有理由认为原子核和外界没有… 显示全部 关注者 179
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