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【单选题】
下列关于电子邮件的叙述中,错误的一条是( )。A.
使用电子邮件通信的必要条件是通信双方都有电子信箱
B.
向对方发送电子邮件时,并不要求对方必须处于开机状态
C.
无论在任何地区,只要接收者能在当地上网,他就能打开他的电子信箱
D.
电子信箱只能在接收者当地的计算机上打开,如果在另一个城市,则无法打开
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