隔离开关没有专门的灭弧装置,所以它不能开断负荷或短路电流,其作用是使停电设备与带电部分有明显断点和用于倒换电力系统运行方式.
参考答案:对
Eton College in England was ______ in 1440 by King Henry VI to give free education to poor students. [ ]
A. cleaned up
B. set up
C. fixed up
D. cheered up
提早出现QRS波,宽0.12s,其前无相关P波()提早出现P波,P-R为0.16s,QRS形态正常()
A.房性早搏
B.房性早搏未下传
C.交界性早搏
D.交界性逸搏
E.室性早搏