【单选题】以下对串级控制系统设计的描述,错误的是( )。
A.
主回路是一个定值控制系统,副回路是一个随动 控制 系统 ;
D.
必须使控制通道具有较高的灵敏度,即控制通道的时间常数适当小一些 。
【单选题】3# 以下对串级控制系统设计的描述,错误的是( )。
A.
主回路是一个定值控制系统,副回路是一个随动 控制 系统 ;
D.
必须使控制通道具有较高的灵敏度,即控制通道的时间常数适当小一些 。
【判断题】P 23 -- Activity 2B Sally and Brad are talking to their bosses on the first day of their new jobs. Check ( √ ) the things they have to do. Put an ( ╳ ) next to the things they don't have to do. Sally ...
【简答题】补全对话(每小题1分,共5分) Dave:Can I ask you some questions, Sally? Sally:Sure! What’s up? Dave: 小题1: Sally:Yes, it’s a little far. Dave: 小题2: Sally:First, I walk to the bus station and then I take the bus. Dav...
【简答题】VIII.补全对话(5分) Sally:Hello,this is Sally speaking. Tina:Hi,Sally.It's Tina here._1_ I don't know what to do. Sally:Don't worry.What's the matte? Tina:My best friend doesn't speak to me. Sally:_2_ Tina:...