下列级数中绝对收敛的是()。
A.A
B.B
C.C
D.D
参考答案:C
工作岗位分析信息的主要来源有()。
A.直接观察
B.事件访谈
C.工作日志
D.书面资料
E.同事报告
Which of the following is NOT a condition of a perfectly competitive market()
A. Sellers make economic profits.
B. Firms face elastic demand curves.
C. Individual sellers each have a small share of the market.