药物半衰期是指 A．药物分布一半所需要的时间 B．血药浓度下降一半所需要的时间 C．

颏孔多朝向（）。

A.前、下、内

B.后、上、外

C.后、下、内

D.前、上、外

E.后、上、内

什么是正式导游证

5叶核以上的中性粒细胞大量增多称为（）

A．Auer小体

B．小体

C．异型淋巴细胞

D．中性粒细胞核左移

E．中性粒细胞核右移

适合多道程序设计的存储管理方式有（）

A.固定分区

B.可变分区

C.页式

D.段式

E.段页式

Under perfect competition, the short-run market supply curve is most accurately described by which of the following statements The market short-run supply curve is the:（）

A. average of the quantities at each price along the marginal cost curve for all firms in a given industry.

B. sum of the quantities at each price along the average total cost curve for all firms in a given industry.

C. sum of the quantities at each price along the marginal cost curves for all firms in a given industry.