宋刻《集韵》 “都感切”即取都的声母和感的韵母，转换成现代汉语拼音就是“dǎn”。 dǎn这个读音来源不详，它有可能源自于“丹”的异体字“☒”（此字知乎显示不出来，暂用“☒”代替，详见 “ ”字的. 张力单位是n，请问dan是什么意思？dan是一个力学单位1 dan = 10 n ps:dan的英文就是decanewton。deca表示“十, 十倍”之意；newton就是牛顿。
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