什么是外反馈？
参考答案：
外反馈把经过整流工作电流送入与控制绕组同样接法的专用绕组中。
根据句义和首字母完成下列单词。
1. My f_______ colour is blue.
2. Your friends look d_______.
3. He has a s________.
4. Danny is h________. He wants to eat.
5. Jack does his h_______ in the evening.
6. I like p_______ for breakfast.
7. Mary likes cereal. It's d________.
8. Would you like a h________?
9. They have lunch in a r________.
10. She doesn't like v________.
道口护桩地面以上高度为（）。
A.500mm
B.600mm
C.700m
D.850mm
