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月球中继
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lunar relay
月球中继
通过单颗中继卫星或中继星座,为处于地面测控通信系统无法直接覆盖到的环月轨道飞行器、月球背面或两极地区的月面着陆器、进行月面活动的航天员或月球车等提供导航定位、通信中继、测轨定轨等服务的技术手段。
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quarkyonic matter
Quarrelsome Lovers
quarry garden
Quarry Garden in Chenshan Botanic Garden
quarrymen Haozi (work songs of quarrymen)
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quarternary structure
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quarter-square
quarter squares rule
quarter-wave line
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quarter-wave plate
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quartic equation with one unknown
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quartic parabola
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