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【单选题】
标识符可以用于变量、函数、对象等的命名,对于标识符描述错误的是A.
标识符不可以以数字开头
B.
标识符可以由数字、字母和下划线组成
C.
标识符不区分大小写
D.
保留字做标识符是会出错
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