微机励磁调节器有哪些功能?
参考答案:
具有自动电压环、电流环调节控制,同时具有欠励限制、过励限制、强励限制、可控硅整流柜快熔熔断、V/F限制、空载过压逆变保护等功能。
纸浆分类
We have worked for such a long time. Shall we stop _______ a rest? [ ]
A. having
B. to have
C. have
D. had