Ctrl + Alt + Delete is the keys used by some PCs to reboot frozen computers by using task manager to kill any nonresponding applications. Another way to do this on some other is Ctrl + Shift + Esc.
Answer: Don't got three explanations don't know a lot but here.
Explanation:
"Citizen journalists cover crisis events using camera cell phones and digital cameras and then either publish their accounts on the Web, or exchange images and accounts through informal networks. The result can be news in real-time that is more local and informative."
Answer:
4)true
5)no(not good for computer )
6)easy
— Look for Sites from Established Institutions.
— Look for Sites with Expertise
— Do not click on Commercial Sites
— Beware of Bias
— Check when it was last updated, so you get recent info.
— Check Links
— Avoid Anonymous Authors.
Answer:
Sir William Crookes invented the cathode ray tube in 1878, but these discoveries took many years to merge into the common ground of television. His mechanical system used a scanning disk with small holes to pick up image fragments and imprint them on a light-sensitive selenium tube. A receiver reassembled the picture.
