34. Cospas-Sarsat comprises a several near polar orbiting satellites and一．
A: a network of land based earth stations
B: several coast stations
C: an earth station
D: some RCCs
A: a network of land based earth stations
B: several coast stations
C: an earth station
D: some RCCs
举一反三
- 143. Details of Coast Radio Station and Radar Stations and Read Stations can found in （ ）
- 170. Frequencies specified for MSI should be used by A: authorized coast stations to broadcast MSI B: a ship station to report MSI to a public coast station C: a ship station to transmit distress alert D: authorized coast stations to transmit distress acknowledgement
- A hump yard is a railway yard found at some freight train stations, used to separate railway cars onto one of several tracks.
- 66. DSC distress alert should direct to（ ）ln vicinity。 A: all stations B: coast stations C: ship stations nearby D: group of specified stations
- 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