问题
问答题 简答题
简述低电压穿越（LVRT）。具体我国电网公司是如何规定的？
答案
参考答案：
低电压穿越是指风力机组端电压降低到一定值的情况下风力机组能维持并网运行的能力。电网电压在620毫秒内降到额定电压的20%时风机不脱网，同时在3秒内电网电压升到额定电压的90%时，风机也不脱网。
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简述低电压穿越（LVRT）。具体我国电网公司是如何规定的？
参考答案：
低电压穿越是指风力机组端电压降低到一定值的情况下风力机组能维持并网运行的能力。电网电压在620毫秒内降到额定电压的20%时风机不脱网，同时在3秒内电网电压升到额定电压的90%时，风机也不脱网。
| 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