正常运行的电力系统,300×104KW及以上系统,频率偏差不超过()。
A.-0.2HZ
B.-0.5HZ
C.±0.2HZ
D.±0.5HZ
参考答案:C
The ancient church was almost before the fire fighter managed to control the fire. [ ]
A. burned down
B. burned out
C. burned off
D. burned up
下一步处理应选择
A.再次检查产道
B.静脉滴注催产素
C.立即剖腹探查
D.子宫全切
E.子宫次全切