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放射线
释义
放射线radiation ray 【化】 radioactive ray radioactive rays 放射线fàngshèxiàn[radioactive ray] 不稳定元素衰变时,从原子核中放射出来的有穿透性的粒子束,分甲种射线、乙种射线、丙种射线,其中丙种射线贯穿力最强
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certificate for advance surrender of export exchange
certificate for export
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更新时间:2026/4/26 2:15:42