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
đã hỏi
30 tháng 7, 2019
trong Tiếng Anh lớp 9
bởi
Phamthunhien
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(20.5k điểm)