孩子卡在这几页几天了
不对，kceh，你已经说好了要对着数学推导不求甚解的了……再卡下去真凉了
@kceh欧洲数学课真的要人狗命😂
@alteredEnvoy问题是我在学固体物理…哭了…
@kceh抱抱🙆固体物理居然能讲到phase difference？我也看麻了😥
@alteredEnvoy就，用X光分析晶体时用傅立叶展开什么的定性定量……………？
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@alteredEnvoy
就，用X光分析晶体时用傅立叶展开什么的定性定量……………？