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natural bitumen
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natural bitumen
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工学
天然沥青
释
natural bitumen
天然沥青
特殊地质结构中的石油,在自然条件下经历千百万年时间,在温度、压力等外环境综合作用下氧化聚合而成的沥青类物质。通常为固体或者黏稠状。
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radar cross section measurement
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radar cross section, RCS
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radar display and control terminal
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Radar Handbook
radar homing guidance
radar image
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