问题
多项选择题
下图所示的自动控制系统属于（）。
A．开环控制系统
B．闭环控制系统
C．反馈控制系统
D．复合控制系统
答案
参考答案：B, C
搜题请搜索小程序“爱下问搜题”
下图所示的自动控制系统属于（）。
A．开环控制系统
B．闭环控制系统
C．反馈控制系统
D．复合控制系统
参考答案：B, C
| 阅读下面对话，从方框内7个选项中选择5个恰当的句子完成此对话，使其意思完整。 | |
| A: Look, there is a bag under the tree. 1. _____________ B: I don't know. Let's have a look. Oh, there is a soccer in it. 2. _____________ A: I don't think so. Many girls enjoy playing soccer now. 3. _____________ B: Yes, there is an English book and a notebook in it. A: Open them and see. 4. _____________ B: OK, you are so clever. Yes, there is an English name here-David. A: I know it must belong to a boy. B: Of course. 5. _____________ A: There're some other words here--Class Eight, Grade Nine. Let's go to find him.
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