That's a basic observation of your posts.

来源: tibuko 于 2019-12-01 15:23:19 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (193 bytes)

Again: have you ever passed a college level physics class?

Look, being clueless is ok.  Don't come speak and remove anyone's doubt about your cluelessness.

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