血管内皮细胞产生（）
A.促红细胞生成素
B.内皮素
C.心钠素
D.前列腺素
E.肾素
参考答案：B
法约尔认为，企业管理活动的内容包括（）。
A、计划
B、组织
C、指挥
D、协调
E、控制
Which of the following statements is most accurate A method of production is economic efficiency when:（）
A. It uses the most advanced science and technology.
B. The cost of fund capital is as low as possibie.
C. The cost of producing a given level of output is as low as possible.
