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The cathode ray tube can be said to be a vacuum tube which contains one or more electric guns. This tube produces images when an electron beam strikes a phosphorescent surface. This tube produces pictures as a form of video signals. The entertainment device, which the cathode ray tube was eventually used for since it produces pictures, is a television set.
It's Microsoft office power point presentation.
You must spread your risks out like don’t put all your eggs in one basket... don’t rely on on thing because is it goes downhill you have no backup