题目内容

在通常的闭环控制系统结构中，系统的控制器和控制对象共同构成了（）。（A）开环传递函数（B）反馈通道（C）前向通道（D）闭环传递函数

A. a
B. b
C. c
D. d

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一个线性系统的稳定性取决于（）。（A）系统的输入（B）系统本身的结构和参数（C）系统的初始状态（D）外界干扰

A. a
B. b
C. c
D. d

根据自动控制技术发展的不同阶段，自动控制理论分为和

. Reading in DepthThere is a short passage with 10 blanks. You are required to select one word for each blank from a list of choices given in the word bank following the passage. Read the passage through carefully before making your choices. You may not use any of the words in the bank more than once.A ) outshineB) OlympicsC) retiredD) measuredE ) leanF ) superiorityG) secondsH) inspiringI ) essentialJ ) qualifyK) track and fieldL) congratulateM) athletesN) epitomeO) recordOn May 31, 2008 a tall, 1. _ young man named Usain Bolt, racing the 100 for just the fifth time, broke fellow Jamaican Asafa Powell's world 2. _ with a time of 9.72 3. _. The six-foot-five sprinter set the sporting world abuzz just ahead of the 4. _, which were held in Beijing later that year. Bolt won his first Olympic medal in Beijing on August 17, 2008, covering the 100 in 9.69 seconds. Bolt would go on to dominate the sport of 5. ______, his 6. _ reflected in his impressive medal count. His success was particularly 7. to Jamaicans, with high schools across the country reporting that the number of 8. trying out for their boys’ and girls’ track teams doubled. Bolt 9. _ from running in 2017. Having won nine gold medals over the course of his Olympic career, Usain Bolt will forever be remembered as a true 10. ______ of athleticism.

合金组织组成物为固溶体、金属化合物和机械混合物。（）

A. 对
B. 错