个人捐款的动机可以分为（）。
A.个人需要动机
B.自我利益
C.外界影响动机
D.税法策略
E.利他动机
参考答案：A, C, E
Which of the following is a characteristic of perfect competition（）
A. There are a few sellers.
B. The products of different firms are sold at different prices.
C. There are no barriers to entry into the market.
依据水利工程招标投标有关规定，潜在投标人依据踏勘项目现场及招标人介绍情况做出的判断和决策，由( )负责。
A．招标人 B．项目法人C．投标人 D．监理人
