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试说明转炉炉渣的来源。

答案

参考答案：

转炉炉渣的主要来源如下：

（1）炼钢过程中有目的加入的造渣材料；

（2）一部分炼钢过程中的必然产物，如原材料带入的杂质和合金元素的氧化产物；

（3）化学和高温热对炉衬、耐火材料的侵蚀作用物。

单项选择题

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 non-personal 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.

Peers are one of the ________agents of socialization.

A．formal

B．indirect

C．primary

D．personal
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判断题

企业的信用标准严格，给予客户的信用期限很短，使得应收账款周转率很高，将有利于增加企业的利润。（）
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