抽样统计是概率论与数理统计在工程中应用的具体方法，且是数学的一个分支。
参考答案：对
He asked ______for the new mountain bicycle.
A．did I pay how much
B．how much I paid
C．how much did I pay
D．I paid how much
可用于治疗巨幼红细胞性贫血的抗贫血药是
A．硫酸亚铁
B．叶酸
C．维生素C
D．右旋糖酐铁
E．维生素B12
