错误:
C2H5OH %2B I2 %2B NaOH %3D CH3I %2B HCOONa %2B NaI %2B H2O
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不需要的字符 ('%')C2H5OH %2B I2 %2B NaOH %3D CH3I %2B HCOONa %2B NaI %2B H2O
^
不需要的字符 ('%')