继电保护、自动装置、控制、信号的二次回路在可能出现操作过电压的二次回路内，应采取降低操作过电压的措施。()
查看答案
听力原文：At last, how did they travel on？
(7)
A. The lame man took the blind man on his shoulders.
B. The blind man took the lame man on his shoulders.
C. They moved on shoulder by shoulder.
D. They marched on separately.
听力原文：M: Our team won yesterday's football game.
W: Oh, you're excited, are you？
Q: What does the woman mean？
(5)
A. The team played football yesterday.
B. The team had better play once again.
C. The man was excited.
D. The man's team is improving.
对单相接地故障，当接地电流大于5A时，电动机应装设有选择性的单相接地保护。()
A. 正确
B. 错误
单相接地电流为10A及以上时，电动机保护装置动作于跳闸。()
A. 正确
B. 错误
微信支付 
支付宝支付