“室内氡气”的概念、定义、翻译、参考文献-科学参考

单词	室内氡气
释义	室内氡气 Encyclopedia 理学放射性元素释 indoor radon室内氡气由建筑和建筑室内装饰、装修导致的室内空气中氡浓度增加，主要来源于地基土壤、建筑材料的氡析出及自来水、天然气使用的氡释放。
随便看	nonnegative combination nonnegative definite nonnegative definite kernel nonnegative definite matrix nonnegative definiteness nonnegative definite quadratic estimate non-negative definite quadratic estimator nonnegative divisor nonnegative element nonnegative function nonnegative integer nonnegative integral kernel nonnegative manifold nonnegative matrix non-negative matrix factorization nonnegative measure nonnegative number nonnegative operator nonnegative orthant nonnegative partial sum nonnegative quadratic form nonnegative semi-definite matrix nonnegative solution nonnegative splitting nonnegativity

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