变压器较好运行状态的负载率约为()之间。
A、30%~50%
B、60%~80%
C、80%~100%
D、100%~110%
参考答案:B
In order to reduce the increasing prices of vegetables,the toll(过路费) if a truck carrying them passes through a toll sration.
A.cancels
B.is canceiled
C.was cancelled
D.had been cancelled
以下()是10kV配电变压器,接线组别的正确表示方法
A.Y,yn0
B.y,yn0
C.Y,Yn0
D.Y,YN0