外壳型和入侵型病毒通常攻击可执行文件，即带有或扩展名的文件。当然数据文件也有受攻击的危险。
Shell and intrusive viruses most commonly attack executable program flies-those with a. com or. exe extension, although data flies are also at some risk.
有四种类型的病毒程序：外壳型、入侵型、操作系统型和源码型。
There are four main types of viruses: shell, intrusive, operating system and source ode.
有四种类型的病毒程序：外壳型、入侵型、操作系统型和源码型。
There are four main types of viruses: shell, intrusive, operating system and source ode．
在中国，烟粉虱传播烟草曲茎病毒和番茄黄曲叶病毒，这些病毒在B生物型入侵前便有之，但新的生物型在感染该等病毒的植株上活得尤为“有滋有味”。
curly shoot virus and tomato yellow leaf curl virus. These predatethe arrival of biotype B, but the new arrival does particularly well on plants infected by them.
有四种类型的病毒程序：外壳型、入侵型、搡作系统型和源码型。
There are four main types of viruses: shell, intrusive, operating system and source code.
病毒对计算机的破坏程度取决于它是操作系统型、外壳型还是入侵型或源码型。
The extent of damage to computer virus depends on it is operating system type, shell type or intrusive or source type.
病毒对计算机的破坏程度取决于它是操作系统型、外壳型还是入侵型或源码型。
The extent of damage to computer virus depends on it is operating system type, shell type or intrusive or source type.
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