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<form>
1.计算机病毒的主要传播途径有______<br>
<input type=checkbox name=c1 value=A>A.光盘和软盘 <br>
<input type=checkbox name=c1 value=B>B.OICQ和BBS <br>
<input type=checkbox name=c1 value=C>C.网络浏览 <br>
<input type=checkbox name=c1 value=D>D.电子邮件和网络<p>
<p>
2.被感染病毒后，计算机可能出现的异常现象或症状有______<br>
<input type=checkbox name=c2 value=A>A.计算机系统出现异常死机或死机频繁<br>
<input type=checkbox name=c2 value=B>B.系统被非法远程控制 <br>
<input type=checkbox name=c2 value=C>C.文件的内容和文件属性无故改变<br>
<input type=checkbox name=c2 value=D>D.自动发送邮件<p>
3.下列病毒发作时，能够破坏硬盘数据的有______<br>
<input type=checkbox name=c3 value=A>A.求职信 <br>
<input type=checkbox name=c3 value=B>B.SirCam <br>
<input type=checkbox name=c3 value=C>C.CIH <br>
<input type=checkbox name=c3 value=D>D.Sulfnbk<p>
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