正确答案: A

相应的数字证书授权机构索取该数字标识的有关信息

题目：为了验证带数字签名邮件的合法性，电子邮件应用程序(如Outlook Express)会向______。

解析：解析：为了验证带数字签名邮件的合法性，电子邮件应用程序(如OutlookExpress)会向相应的数字证书授权机构索取该数字标识的有关信息。

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学习资料的答案和解析：

[单选题]Computer systems consist of two very different types of elements:(71 ) , which includes all the physical things that can be touched and Software, which tells the hardware how to do.

Hardware