Modern communications satellites use a variety of orbits, including ( ).
A: geostationary orbits
B: Molniya orbits
C: elliptical orbits
D: low (Polar and non-polar) earth orbits
A: geostationary orbits
B: Molniya orbits
C: elliptical orbits
D: low (Polar and non-polar) earth orbits
举一反三
- The truth ________ the moon orbits the sun is doubted by some scientists.
- Most asteroids, which are made of rock, ＿themselves＿ a belt between the orbits of Mars and Jupiter.
- The United States (has sent) several (spacecrafts) into orbits (around the earth) and has collected a lot of (information)（） A: has sent B: spacecrafts C: around the earth D: information
- The space station is made of parts that were assembled in space by astronauts and ________ Earth at an average altitude of approximately 250 miles. A: programs B: spins C: travels D: orbits
- 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