励磁机励磁系统
参考答案：
使用励磁机励磁功率单元的励磁系统。
When Daniel is in a bad mood, he likes to wear orange to _________.
A．wake himself up
B．cheer himself up
C．give himself up
D．cheer up himself
下列有关热原性质叙述中错误的是（）
A.水溶性
B.耐热性
C.滤过性
D.挥发性
E.强酸强碱能破坏
