Radar is an electronic device that can see great distances (1)_____fog, rain, snow, cloud, and darkness. It can find and (2)_____locate missiles, aircraft, ships, cities, rainstorms, and mountains. Radar uses radio waves, (3)_____light waves, which the human eye uses in seeing ... D. guidance 9. A. vessel B. vessels C. sail D. sails 10. A. to approach B. approaches C. approach D. approaching
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22 tháng 3, 2021
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