220kV系统振荡周期一般可取( )。
A.不大于1.5s; B.不小于2s; C.不大于2.5s; D.不大于3s。
参考答案:A
Corzine’s Downfall
Corzine stained the reputation of Goldman Sachs in that he is not ______. A. competent as a chief executive B. insistent as a reform promoter C. faithful as a business partner D. qualified as a financial expert
以下草种中,属于结缕草属的是()。
A、扫帚草
B、剪股颖
C、天鹅绒草
D、芒草