转速单闭环调速系统有哪些特点?
参考答案:
转速单闭环调速系统增加了转速反馈环节,可获得比开环调速系统硬得多的稳态特性,从而保证在一定静差率下,能够提高调速范围。
I shall take you back to Beijng as soon as you are to travel
A good enough B enough good C well enough D enough well
属于条件致病菌的细菌是()
A.破伤风梭菌
B.产气荚膜梭菌
C.难辨梭菌
D.肉毒梭菌
E.酪酸梭菌