最低有效字符 [计] least significant character
最有效字符 MSC
有效字符串 Valid String ; VST
卷标中有无效字符 Invaaalid characters in volume label
有效连接字符串 valid connection string
文件里有无效字符 invalid character in file
有效位起动字符 significance start character
字符有效组 character validity set
最低有效数字或字符 least significant digit or character
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