变压器在冲击合闸或新装变压器在空载试运行期间,重瓦斯保护必须投入()
A.信号
B.运行
C.跳闸
D.解除
参考答案:C
The factory ________ in the newspaper that they had some old machines for sale.
A.selected
B.solved
C.designed
D.advertised
电力企业生产管理实际上是对()。
A、发电厂管理;
B、供电管理;
C、用电管理;
D、电网管理。