错误:
CH3COCH3 %2B I2 %2B NaOH %3D HCOONa %2B CHI3 %2B HI
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不需要的字符 ('%')CH3COCH3 %2B I2 %2B NaOH %3D HCOONa %2B CHI3 %2B HI
^
不需要的字符 ('%')