“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	welding nondestructive inspection welding nondestructive test welding of dissimilar metal welding of magnesium alloys welding of metal welding of superalloy welding qualification and certification welding remanufacturing welding robot welding stress welding thermal cycle welding transformer welding under nuclear environment welding wire welfare breeding Welfare centre welfare facilities for the disabled persons welfare facility room welfare fish separating welfare home for the elderly welfare institution Welfare pluralism theory welfare services for adolescent welfare sociology welfare state system

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