内部收益率作为评价投资方案经济效果的指标，其特点包括( )。
A．能够直接衡量项目未回收投资的收益率
B．需要有大量与投资项目有关的数据
C．需要事先确定一个基准收益率
D．能够反映项目单位投资的盈利能力
E．其大小不受外部参数的影响
参考答案：A,B,D
解析： 内部收益率(IRR)指标考虑了资金的时间价值以及项目在整个计算期内的经济状况；能够直接衡量项目未回收投资的收益率；不需要事先确定一个基准收益率，而只需要知道基准收益率的大致范围即可。不足的是，内部收益率计算需要大量的与投资项目有关的数据，计算比较麻烦，但能反映投资过程的收益程度，而其大小不受外部参数的影响。
| The first and most important agents of socialization are the people who care for infants. In the earliest months, messages from nurturers constitute the child’s basic understanding of the world around it. This is the infant’s first introduction to the language that shapes perception and elicits emotion. Another powerful source of information and socialization is the friendship of peers. Peers are equals that one can deal with on the same level as oneself, whereas parents are superiors. The heavy emotional overlay of family relationships makes some kinds of learning difficult. Much formal socialization is placed in the hands of professionals. Teachers from kindergarten on are specifically designated agents of socialization. Ideally, a teacher is one who has both knowledge and the skills to present it. During the course of teaching their subjects, classroom instructors provide role models and attempt to convey the excitement of learning itself. In earlier times, parents, friends and teachers would comprise the list of primary childhood socializers. Children’s books, comics and magazines might also have been mentioned as sources of information on norms and role models. Today one must add three powerful indirect or nonpersonal socialization agents: radio, movies and television. Many people learn about politics, form a vision of well-being, and develop attitudes towards others from what they see on the screen and hear through the speakers. |
In this passage, agents of socialization refer to ______.
A．the media
B．individuals
C．all channels
D．organizations