以SF6为介质的断路器,其绝缘性能是空气的2~3倍,而灭弧能力为空气的()倍
A.30;
B.50;
C.80;
D.100。
参考答案:D
The other day he ______ a dollar bill in the suit he was sending to the cleaner’s.
A.came to
B.came across
C.came into
D.came through
6KV开关断不开原因有()
A、TQ线圈烧坏
B、控制回路问题
C、开关机构故障
D、限位损坏