《继电保护和安全自动装置技术规程》规定,对220kV~500kV并联电抗器,当电源电压升高并引起并联电抗器过负荷时,应装设过负荷保护,保护带时限动作于()。
参考答案:信号
根据文章内容填写适当单词。
A little rabbit 1 _ with a balloon. Suddenly the balloon 2 _ away. It went farther and
farther until he couldn't see it any more. The little rabbit began 3 . “Don't cry, "a bird in the sky said.
"I 4 it for you.” After a while, the bird returned with the balloon. "Here you are.” The little rabbit was
surprised and glad to see the balloon. "Thank you very' much.” This made him 5 in the end.
高频对空通信和航路甚高频对空通信设备在运行中不能提供正常的通信保障的时间,不能超过()。
A.3分钟,1分钟
B.5分钟,3分钟
C.5分钟,1分钟
D.均为3分钟