“snow-covered days”的概念、定义、翻译、参考文献-科学参考

单词	snow-covered days
释义	snow-covered days Encyclopedia 农学积雪日数释 snow-covered days积雪日数对于积雪日的定义，在中国积雪研究中存在两种标准，第一种是根据天气现象来定义，即当观测场上视野范围内一半以上被积雪覆盖时，就记为积雪日；第二种是根据积雪深度来定义，即当积雪面积达到观测要求，且其深度达到规定深度（例如0.5厘米以上深度的积雪）时，记为积雪日。
随便看	propositional axiom propositional calculus propositional connective propositional constant propositional form propositional formula propositional fragment propositional function propositional inference propositional intermediate logic propositional logic propositional mu-calculus propositional quantifier propositional representation propositional system propositional value propositional variable propositional variable; sentential variable propositional μ-calculus Proposition Bank proposition bank proposition obtained by polarity proposition of divide conclusion form proposition or example as negative evidence proposition or example as positive evidence

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