问答题
简答题
电力系统继电保护的基本原理是什么?
【参考答案】
继电保护主要利用电力系统中元件发生短路或异常情况时的电气量(电流、电压、功率、频率等)的变化,构成继电保护动作的原理,也......
(↓↓↓ 点击下方‘点击查看答案’看完整答案 ↓↓↓)
点击查看答案
相关考题
-
单项选择题
A cargo of refrigerated fruit is packed in crates with transverse members dividing the crate in two equal parts. Which statement is TRUE?()
A.The cargo block should be tightly packed if the cargo is suitably chilled upon delivery to the vessel
B.Both sides of each crate must be checked for the temperature and the appearance of the fruit
C.The cargo block should be stowed with air channels built throughout the stowed cargo
D.The crates should NEVER be stowed brick fashion -
单项选择题
单核花粉进一步发育形成生殖细胞和营养细胞时,所进行的分裂是一种()
A.非对称的减数分裂
B.对称的有丝分裂
C.非对称的有丝分裂
D.对称的减数分裂 -
多项选择题
常见的辅助疏散逃生设施有哪些()。
A.避难逃生口
B.救生缓降器
C.救生索
D.救生气垫
