| 11. | The operation makes upper-stage rockets and turbopumps for the space shuttle's main engine.
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| 12. | :Sounds like a multi-stage rocket, only less efficient and more complex.
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| 13. | It is China's first upper stage rocket engine to adopt the staged-combustion cycle.
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| 14. | NASA is focusing on multi-stage rockets for the second generation spaceship.
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| 15. | The slightly worrysome part is that this was a multi-stage rocket.
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| 16. | It does research and is developing a lower-stage rocket with a Russian company.
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| 17. | It was the site where the first single-stage rockets with multiple engines were tested.
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| 18. | The idea with a one-stage rocket is to save money.
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| 19. | The Rehbar-I was a two-stage rocket with all solid-propellant motors.
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| 20. | The projectile design therefore included a one-stage rocket which ignites some time after launch.
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