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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