[免费作业] _________a solution to the problem of water shortage, we hav 日期:2021-10-25 15:05:45 点击:139 好评:0
(单选题)30: _________a solution to the problem of water shortage, we have to put all our efforts together. A: To work out B: Working out C: Work out D: Being worked out ...
[免费作业] Looking through the telescope(望远镜),the captain _________ 日期:2021-10-25 15:04:55 点击:190 好评:0
(单选题)24: Looking through the telescope(望远镜),the captain _________a whale slowly emerging from the water. A: revealed B: searched C: scanned D: spotted ...
[免费作业] The girl is __________ of a film star. 日期:2021-10-25 15:04:15 点击:59 好评:0
(单选题)18: The girl is __________ of a film star. A: somebody B: something C: anybody D: anything ...
[免费作业] The Democratic Party must reach out to the people and ______ 日期:2021-10-25 15:03:28 点击:184 好评:0
(单选题)12: The Democratic Party must reach out to the people and _________its message if it is to win the election. A: figure out B: take over C: drive home D: throw up ...
[免费作业] I had my meals _________ when I was ill in bed with a bad co 日期:2021-10-25 15:02:46 点击:112 好评:0
(单选题)6: I had my meals _________ when I was ill in bed with a bad cold. A: to bring B: bring C: brought D: bringing ...
[免费作业] 一个线性系统稳定与否取决于输入信号的形式及系统本身的结构和参 日期:2021-10-25 15:01:52 点击:177 好评:0
(判断题)50: 一个线性系统稳定与否取决于输入信号的形式及系统本身的结构和参数。( ) A: 对 B: 错 ...
[免费作业] 闭环零点影响系统的稳定性( ) 日期:2021-10-25 15:01:08 点击:126 好评:0
(判断题)44: 闭环零点影响系统的稳定性( ) A: 错误 B: 正确 ...
[免费作业] 二阶系统的闭环增益加大 ( ) 日期:2021-10-25 14:59:22 点击:64 好评:0
(单选题)26: 二阶系统的闭环增益加大 ( ) A: 快速性越好 B: 超调量越大 C: 峰值时间提前 D: 对动态性能无影响 ...
[免费作业] 若某系统的根轨迹有两个起点位于原点,则说明该系统( ) 日期:2021-10-25 14:58:42 点击:190 好评:0
(单选题)20: 若某系统的根轨迹有两个起点位于原点,则说明该系统( ) A: 含两个理想微分环节 B: 含两个积分环节 C: 位置误差系数为0 D: 速度误差系数为0 ...
[免费作业] 典型欠阻尼二阶系统,当开环增益K增加时,系统 ( ) 日期:2021-10-25 14:57:34 点击:143 好评:0
(单选题)7: 典型欠阻尼二阶系统,当开环增益K增加时,系统 ( ) A: 阻尼比增大,超调量增大 B: 阻尼比减小,超调量增大 C: 阻尼比增大,超调量减小 D: 无阻尼自然频率减小 ...