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屏蔽体
根据射线通过物质时被减弱的原理,将外照射剂量减少到剂量限值以下而专门设计、建造的保护性物体或装置。又称屏蔽物。
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克拉通中有前寒武纪结晶基底和高级变质岩大面积出露、周缘被有盖层的地台所环绕、平面形态呈盾状的地区。
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forestry macro-regulation
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Forestry mobile information collection
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forestry of Africa
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