单项选择题
PID控制器的效果一定优于PI和PD控制器。
未知题型PID控制器的效果一定优于PI和PD控制器。
They stopped ________ () when the teacher came in.
未知题型They stopped ________ () when the teacher came in.
Both Lucy and her classmates are in poor health. 露西和她的同...
未知题型Both Lucy and her classmates are in poor health. 露西和她的同学身体都出现了问题。