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@@ -41,4 +41,15 @@ Program：
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- 判断同一个碳原子上面的氢，是否是非对映质子
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+回答标题：首先通过对称性判断化学等价性，然后考察是否磁等价；这之外需要考察快速交换导致的化学等价性质。
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+**if a plane of symmetry or an axis of symmetry makes two or more nuclei equivalent by symmetry, then they are said to be chemically equivalent.** 这个出 Rotational axis or Symmetry plane (or by a rapid exchange mechanism)
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+困难在判断磁等价，以及快速交换的化学等价。
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