The 24 satellites in the Global Positioning System ( GPS ) are synchronous satellites, and they appear to be stationary to an observer on the earth.
The 24 satellites in the Global Positioning System ( GPS ) are synchronous satellites, and they appear to be stationary to an observer on the earth.
These satellites constantly transmit an identifying .
These satellites constantly transmit an identifying .
One or two man-made satellites _______ in this country every year.
One or two man-made satellites _______ in this country every year.
Geostationary satellites are the man-made satellites which . A: are always fixed in the regular position B: sometimes move with the earth C: are synchronizing with the movement of the earth D: can not fly off from the ground
Geostationary satellites are the man-made satellites which . A: are always fixed in the regular position B: sometimes move with the earth C: are synchronizing with the movement of the earth D: can not fly off from the ground
Why do we use the weather satellites to take pictures of the atmosphere? Because __________.
Why do we use the weather satellites to take pictures of the atmosphere? Because __________.
The photos of Mars taken by satellites are (clear) ______ man those taken from Earth.
The photos of Mars taken by satellites are (clear) ______ man those taken from Earth.
It is possible to use satellites to predict earthquakes because satellites ________. A: take pictures of the Earth B: catch radio waves sent from the Earth’s surface C: are sensitive to Earth’s movements D: see almost the entire Earth
It is possible to use satellites to predict earthquakes because satellites ________. A: take pictures of the Earth B: catch radio waves sent from the Earth’s surface C: are sensitive to Earth’s movements D: see almost the entire Earth
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
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
The photos of Mars taken by satellites (卫星) are (clear)______ than those taken from the Earth.
The photos of Mars taken by satellites (卫星) are (clear)______ than those taken from the Earth.
The photos of Mars taken by satellites(卫星) are(clear) ______ than those taken from earth.
The photos of Mars taken by satellites(卫星) are(clear) ______ than those taken from earth.