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【单选题】从标有1,2,3,4,5,6,7,8,9的9张卡片中任取2张,那么这2张卡片数字之积为偶数的概率为
【简答题】There is a park near our school. We can see many trees and flowers there. We can see a hill behind the park, too. At the foot of the hill we can see a river. There are some boats on it. It is Sunday t...
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【简答题】护理质量标准分类:根据管理过程结构分为____、______和______。