Answer the following questions: -          Where are spaceships launched from?
-          What are manned and unmanned ships used for?
-          Do all the ships return to the Earth?
-          What signals do artificial satellites relay?
-          What purpose do they serve?
-          What are the functions of active satellites?
-          What makes it possible to carry out intercontinental transmission?

дарханнысанов    2   15.02.2021 12:19    4