问答题a nib pen that draws ink from an ink bottle through a feed to the nib and then deposits the ink on paper
问答题( )是指抽样估计值与总体指标值之间的离差 ( )是衡量抽样误差大小的核心指标 ( )是指以样本估计总体在某种概率意义下所允许的最大误差 答案格式:xxx;xxx;xxx 注:按序作答