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08级听力课第4学期第1次VOA新闻作业0301VOA-New Ukrainian President Meets EU Leaders in Brussels Paris Ukraines new president Viktor Yanukovich says he ismitted to establishing closer ties with the European Uni
09级听力课第4学期第6次VOA新闻作业 0329VOA-Haiti Waits for Results of Second Round of Elections Authorities say the results will be made public next Monday instead of this Thursday as originally planned. Anal
UNIT 3Part 3 NewsNews item 1 This presidential election is creating unusual interest and excitement across America especially with young people and Democrats. The Democrats hope to reclaim the Wh
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1 设单位反馈系统的开环传递函数为,试求系统的上升时间、峰值时间、最大百分比超调量、调整时间和振荡次数。解:由单位反馈系统开环传递函数得到系统的闭环传递函数为:则:,,则有:,,上升时间为: 峰值时间为: 最大百分比超调量为: 误差取时的调整时间为:误差取时的调整时间为:振荡次数为:,2P105 315解:由系统开环传统函数可知,系统为I型,开环增益为100稳态误差系数:,,输入为,包含阶跃、
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