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### 1. ? ~~~ 按住Alt鍵不放，然后輸入169。松開Alt鍵后或 &copy ~~~ ### 2. 平方 ~~~ 1（一次方符號） ¹ 2（平方符號） ² 3（立方符號） ³ ~~~ ### 3.左右尖括號 ~~~ < <　　<= ≤ > >　　>= ≥ ~~~ ###4. 其他符號 ~~~ https://blog.csdn.net/HTML5_styy/article/details/53670563 ~~~

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