下面是US - ASCII编码字符集中这些函数将采用百分号编码的的可打印字符列表，码值为32到126(十进制)。
Following is a list of printable characters from the US-ASCII coded character set, specifically the octets ranging from 32 to 126 (decimal), that the functions will percent-encode.
原来的ASCII 7位字符集将字母、货币、数字和控制码信息映射为十进制、八进制和十六进制数字。
The original ASCII 7-bit character set mapped the letters, and monetary, numerical, and control-code information to decimal, octal, and hexadecimal numbers.
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