The parties and trips the Manhattan Sailing Club hosts aim to
A. provide the members with field training.
B. offer the members a chance to enjoy the sports.
C. form. a casual social atmosphere among the members.
D. give the elderly members a different experience.
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Which of the following would be the best title for the passage？
A. Not-So-Exclusive Sailing Clubs
B. Sailing, a New Upbeat Sport
C. Recreations of Manhattan Young Elites
D. Sailing, an Elegant Alternative
What is the main idea of the passage？
A. The analysis on the positive and negative side of innovation.
B. The optimistic aspects of the development of innovation.
C. The pessimistic prediction of the development of innovation.
D. The main problem facing innovation and the solution.
According to Charlie Nobles, the sailing clubs should
A. emphasize the energy-saving characteristic of the sport.
B. be aware of the risk elderly people may take in the sport.
C. make sure the staffs are all qualified and certified.
D. take effort to lower the average age of their members.
积分控制的特点是______。
A. 调节作用及时;调节过程结束后存在静态偏差
B. 能消除静态偏差;容易导致调节过头，降低了系统的稳定性
C. 具有超前调节作用，使最大动态偏差明显下降，且能提高系统的稳定性
D. 具有智能控制功能，能自动调整参数
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