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对控制系统提出的基本要求是_________。
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试题答案:
第1空:[ "达到稳定性、快速性、准确性要求。" ]
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控制系统稳定性的定义是什么?
控制系统中延时环节对稳定性的影响是___
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1. Cultures tend to favor either a past, present, or future orientation with regard to time. A future orientation, a preference for change, is characteristic of American culture. The society encourages people to look to the future rather than to the past. Technological, social, and artistic trends change rapidly and affect people's lifestyles and their relationships.Given this inclination toward change, it is not surprising that tradition plays a limited role in the American culture. Those who try to uphold traditional patterns of living or thought may be seen as rigid or "old-fashioned". In a society where change is so rapid, it is not uncommon for every generation to experience a "generation gap '. Sometimes parents struggle to understand the values of their children. Even religious institutions have had to adapt to contemporary needs of their followers. Folk singers in church services, women religious leaders, slang versions of the Bible, all reflect attempts made by traditional institutions to "keep up with the times".High rates of change, particularly in urban areas, have contributed to a focus on the future rather than the past or present. Some Americans believe that the benefits of the future orientation are achievement and progress which enable them to have a high standard of living. Others believe that high blood pressure and stomach ulcers are the results of such a lifestyle.As individuals in a culture, we all have an intuitive understanding about how time is regulated. Usually we do not think about the concept of time until we interact with others who have a different time orientation. Although individuals from any two cultures may view time similarly, we often sense that in another culture, life seems to proceed at either a slower or faster pace. Knowing how time is regulated, divided, and perceived can provide valuable insights into individuals and their cultures.(5分)1.1 American orientation toward the future might be demonstrated by____.(1分)A. the presence of religious institutionsB. the preference for "old-fashioned" parentsC. the limited role of traditionD. the presence of folk singers in church services
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