川大学计算机网络考试A.doc

四川大学期 考试试题（闭卷） A卷 （2009 ——2010 学年第 1 学期） 课程号 课序号： 0 课程名称：专业英语 任课教师：杨晓梅 成绩： 适用专业年级： 06级自动化本科 学生人数：118人 印题份数：125 学号： 姓名： 考 试 须 知 四川大学学生参加由学校组织或由学校承办的各级各类考试，必须严格执行《四川大学考试工作管理办法》和《四川大学考场规则》。有考试违纪作弊行为的，一律按照《四川大学学生考试违纪作弊处罚条例》进行处理。 四川大学各级各类考试的监考人员，必须严格执行《四川大学考试工作管理办法》、《四川大学考场规则》和《四川大学监考人员职责》。有违反学校有关规定的，严格按照《四川大学教学事故认定及处理办法》进行处理。 注意：所有答案写在答题纸上 一、 For parallel connection, the overall transfer function is simply the _________of individual transfer functions. A. sum B. difference C. product D. ratio The Laplace transformation ratio of the output to the input for a system is called_____ A. behavior of the system B. transmitting function C. transform function D. transfer function A second–order system with _________ larger than one is referred to as ______ system A . damping ratio B. damped frequency C. underdamping D. overdamping As damping ratio is . increased，the system overshoot _________ A. increases B. decreases C. is constant D. decays The steady state performance of a system is best defined of ____________ A. error parameter B. error constant C. Steady state error D. Transient error If the system does not have any______, the system can be called ________system A. output B. feedback c. an open loop D. input The equation is called _____________ A. differential equation B. difference equation C. derivative equation D. integral equation A __________ is a constant velocity and is represented as r(t)=At (t=0) A. impulse input B. step input C. ramp input D. parabolic input In the second-order system for the damping ration (1, the system is called ______ system; for (=1, the system is of _________system A. underdamping B. critical damping C. overdamping D. No damping The ________ is used to deliver an output signal which is larger than the input signal A. subt