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【单选题】
以下关于计算机病毒的描述中,正确的是______。A.
计算机病毒是一段可执行程序，一般不单独存在
B.
计算机病毒除了感染计算机系统外，还会传染给操作者
C.
良性计算机病毒就是不会使操作者感染的病毒
D.
研制计算机病毒虽然不违法，但我们也不提倡
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