电力系统继电保护运行统计评价范围里有()。
A.发电机、变压器的保护装置
B.安全自动装置
C.故障录波器
D.站用直流系统
参考答案:A, B, C
Today is Children's Day. There are lots of people inHappy Valley. It's very ______ .[ ]
A. busy
B. uncrowned
C. hot
D. crowded