过电流保护远后备灵敏度校验时其校验条件需要考虑:( )。
A. 两相短路
B. 最小运行方式
C. 相邻线路末端故障
D. 以上都是
查看答案
电网终端的保护,过电流保护动作时限并不长,可以作为主保护兼后备保护。( )
A. 对
B. 错
How does Little Brad comfort his mother？
A. He says that they can overcome the difficulties.
B. He says that they can find a different way.
What does Little Brad want to say to his Dad？
A. He makes those weird actions willfully.
B. He make those weird actions unintentionally.
混凝土中的水泥砂浆，在混凝土硬化前后起( )作用
A. 胶结
B. 润滑和胶结
C. 填充
D. 润滑和填充
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