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自击漏
大型自动击水钟,是朝鲜世宗时期宫廷都工匠护军蒋英实(1383~1450)设计制造的计时装置,综合了中国传统水漏与阿拉伯落球动力传输系统。又称自击宫漏。
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unmanned aerial vehicle flight test
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unmanned aerial vehicle sense and avoid
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unmapped petroleum initially in place
unmeasurability of absolute direction of space
unmeasurability of absolute position of space
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