around the earth, Total:25 items.
In the international standard classification, around the earth involves: Telecommunications in general, Radiocommunications, Sports equipment and facilities, Valves, Acoustics and acoustic measurements, Aircraft and space vehicles in general, Ergonomics.
Calibration method of vibration and shock sensor Earth gravity method calibration, 1/40000000th of the earth's circumference, Earth's earliest organisms, everything from earth, around the earth, the interior of the earth, geochemical and geological samples, Power flux density of an earth station, In which country is the center of the earth, Radiation from satellites to Earth, The content of titanium in the earth, Without affecting the surrounding of the laboratory, Quality factor of an earth station, Earth's own conditions.
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