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types of computer viruses
1. polymorphic virus
2. worm
3.trojan horse
4.directory virus
5.boot virus
6.directory virus
7. macro virus
8. web scripting virus
9. memory resident virus
10. overwrite virus
11. direct action virus
12. multipartite virus
Turn off the device and let the machine cool down.
The four<span> separate </span>strokes<span> are termed: ... While the piston is at T.D.C. </span><span>the compressed air-fuel mixture is ignited by a spark plug (in a </span>gasoline engine) or by heat generated through high compression<span>, forcefully returning the piston to B.D.C.
Hope this helps! : )</span>
System options , restart, reset, or shut down computer etc.