题目内容
堆肥化的主要影响因素有：碳氮比、含水率、温度、通风、pH、有机物含量、粒度等。
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实际生产中一般用一定量的熟堆肥回流至堆肥原料，以调节水分，并起接种微生物的作用。
Is Spring ____________ a common holiday for the ____________ Asiancountries?
My family makes it a rule that every member has to take part in the __________cleaning.
Some universities have a special canteen for the ____________, because theyhave strict tradition on food.
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