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” 63 G92 单引号字符(single quote) “ G92” 39@nts@23 G94 双引号字符(double quote) “ G94” 34 空操作（null），字符串结束符 0 ddd 1 到 3 位八进制数代表的...
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这意味着，在单引号字符串，单引号字符必须逃，在双引号字符串，双引号字符必须逃跑。
This means, inside single quoted strings, the single quote character has to be escaped, and inside double quoted strings, the double quote character has to be escaped.
您还可以简单地将整个字符串放到单引号(')中，但是需要在变量中真正的单引号字符前面加上一个反斜线(\ ')。
You can also simply enclose the entire variable value in single quotation marks (') as long as you precede any actual single quotation marks in the variable with a backslash (\ ').
根据句法，在uri字符串前后使用引号(单引号或双引号)，并用冒号将前缀分隔开；对其它字符没有任何规定。
Syntactically, you use quotes (single or double) around the URI string, and a colon to set off the prefix; other characters present no interference.
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