The satellites of GPS orbit on six orbital planes spaced at （ ） intervals around the equator.
A: 120°
B: 90°
C: 30°
D: 60°
A: 120°
B: 90°
C: 30°
D: 60°
举一反三
- The space segment of GPS consists nominally of 24 satellites operating in six orbital planes spaced at 60° intervals around the equator. （ ）
- 梯形螺纹的牙型角为 （ ）。 A: 29 ° B: 30 ° C: 33 ° D: 40 °
- Which of the following statements about the constellation of GLONASS is correct？ ( ) A: There are 24 satellites equally spaced in three orbital planes B: GLONASS is suited for the usage in high latitudes C: GLONASS uses a nominal altitude of 19,100 km D: GLONASS uses 64.8°nominal inclination angle with the equatorial plane of the Earth
- 设f,g是R上的多项式,那么deg(f+g)=max{deg(f),deg(g)}。()
- 当四杆机构处于死点位置时，机构的压力角为( )。 A: 180 ° B: 90° C: 与构件有关 D: 0 °