【单选题】3 4 、 4P ′ S 组合是指 ()
【单选题】Tony used the _______ to take the piece of glass out of his foot.
【单选题】Tony used the _______ to take the piece of glass out of his foot.
【判断题】在其他条件一致的情况下,总体的标志变异系数越大,则抽样误差会越大。
【简答题】Tony used the ______ to take the piece of glass out of his foot.