根据我国茶叶加工分为初、精致两个阶段的实际情况,将茶叶分为( )和( )两大部分,其中毛茶分为红茶、绿茶、乌龙茶、白茶、和黑茶五大类。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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