【单选题】【消耗次数：1】
He is quite sure that it’s _____ impossible for him to fulfill the task within two days.
①
roughly
②
exclusively
③
fully
④
absolutely
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a little did he hear
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随机题目
【单选题】
对甲乙两个工厂工人平均工资进行纯随机不重复抽样调查，调查的工人数一样，两工厂工资方差相同，但甲厂工人总数比乙厂工人总数多一倍，则抽样平均误差( )。
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【单选题】
在一定的抽样平均误差条件下( )。
①
扩大极限误差范围，可以提高推断的可靠程度
②
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