1. Open Source Software
    2. Office of Space Science
    3. Operational storage site
    4. Operation Support System
    5. Office Support System
    6. Operational Support Systems
    7. Office of Space Station
    8. Office of Strategic Services
    9. Orbiting Space Station
    10. OEX Support System
    11. Office of Safeguards and Security
    12. Observation System Simulation
    13. Object Services Standard
    14. Office of Space Sciences

    tác giả


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