单词：propulsion bulb
单词：propulsion bulb 相关文章
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Visionary Ideas Could Transform Future NASA Missions NASA, the U.S. space agency, has awarded $3 million in grants for 30 proposals which explore new ideas for Americas next generation space program. The proposals reflect wide-ranging visions of new
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One of the two kitchen light bulbs was out. It was circular and fluorescent. He placed a chair under the light. He stood on the chair. He unscrewed three screws. He removed the plastic cover. He removed the bad bulb. He inserted a new one. He screwed
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By Mario Ritter Broadcast: November 18, 2003 This is Steve Ember with the VOA Special English Agriculture Report. If you like flowers in the early spring, then the middle of autumn is an important tim
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Scientists Testing Space Propulsion by Light 科学家测试太阳能动力 Can the sun provide power for a spaceship to travel to the edge of our solar system? The answer may come from a small satellite. A Delta V rocket carried the satellite into s
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NASA Working Toward Mission to Mars The head of the National Aeronautics and Space Administration, or NASA, said that the space agency is on track to land people on Mars in the 2030s. Charles Bolden is the administrator for NASA. He said that five ye
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