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单选题
下列哪项不是有效的标识符？（）
A
userName
B
2test
C
$change
D
_password
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单选题You are the administrator of 30 Windows XP Professional computers. The computers are not members of a domain. Users of the Windows XP Professional computers encrypt files on the local computers. A user named Stephen reports that he cannot remember his current password. However, he does remember his previous password. Before he changed to his current password, Stephen created a password reset disk. You want to ensure that Stephen can log on to his Windows XP Professional computer again, and that he can open the encrypted files. What should you do?（）A
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单选题下列关于标识符的叙述正确的是哪项？（）A
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