发电机过激磁保护是反应发电机因频率降低或者（）过高引起铁芯工作磁密过高的保护.
参考答案：电压
回答下列问题。
1. How old are you?
______________________________
2. Where's the Chinese book?
3. What year were you born?
4. Is there a pen on the desk?
5. Who's that in the photo?
6. What do you like?
7. What color is it?
8. When is your birthday?
动脉硬化闭塞症Ⅲ期的主要临床表现是（）
A.间歇性跛行
B.营养障碍、色素沉着
C.患肢持续性疼痛
D.患肢麻木、发凉
E.组织坏死
