Unlike the American GPS, Russian GLONASS, and European Galileo systems, which use median Earth orbit satellites, BeiDou-1 uses satellites in （ ）. A: Geostationary orbit B: Circular orbit C: Sun-synchronous orbit D: Near polar orbit

How many conic sections exist in the Earth-Mars transfers? A: Earth-centered parabola orbit B: Sun-centered elliptical orbit C: Earth-centered hyperbola orbit D: Mars-centered hyperbola orbit

Mercury complete its orbit around the sun in only ______.

orbit [br][/br] (1.0) A: 咨询 B: 轨道 C: 排演 D: 练习

Scientists managed to _____ a satellite in orbit around the planet Venus. A: laundry B: set C: launch D: set out

The company says it will take telecommunications equipment into an around the moon by the end of 2022. A: habit B: rabbit C: orbit D: parrot

The satellites of GPS orbit on six orbital planes spaced at （ ） intervals around the equator. A: 120° B: 90° C: 30° D: 60°

Which of the following countries still cannot send a human in space orbit, according to the text A: Japan B: United States C: Russia D: China

Which of the following phenomena can be said to be the performance of the Dao? A: wood grain B: planetary orbit C: apple fell from a height to a low position D: farmers' rebellion

‏ Which of the following phenomena can be said to be the performance of the Dao?‌ A: wood grain B: planetary orbit C: apple fell from a height to a low position D: farmers' rebellion