试说明电力系统中限制切空载线路过电压的措施有哪些?
参考答案:
(1)断路器的灭弧性能,减少或避免电弧重燃
(2)在断路器中加装并联分闸电阻
(3)装设避雷器。
As is often the _______, the housewife gives the house a thorough cleaning ________. [ ]
A. matter; every two days
B. situation; each second day
C. same; each two days
D. case; every second day
企业年金基金的投资管理人如果是综合类证券公司,其任何时候都要维持不少于()纪元人民币的净资产。
A.1
B.2
C.10
D.50