发变组非电气量保护包括哪些?是否启动失灵保护?
参考答案:
主变、厂变瓦斯,厂变、主变压力释放,发电机断水,励磁系统故障;非电量保护不启动失灵。
Judging from his face_______ there was a confident smile, we knew that he didn’t lose heart.
A.in which
B.from which
C.by which
D.on which
泌尿系统有各种影像学检查方法,下列哪种不属于影像学检查()
A.普通X线检查
B.尿路造影检查
C.DSA检查
D.显微镜下尿液的检查
E.核素显像检查