信号隔离器作用是（）。
参考答案：消除干扰信号，起保护作用
改错，找出错误之处并在横线上改正。
1. Have any juice, please.
2. Can I have some apple?
3. Here are you.
4. No, I do.
5. I like watermelon very.
勘验、检查
