相关考题
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单项选择题
（）是真空断路器的绝缘和灭弧元件。
A、辅助开关
B、真空灭弧室
C、波纹管
D、操动机构 -
单项选择题
Their government said that they had to use force to maintain social stability，but many people（）that it wouldn’t（）stability and harmony.
A.contradicted them by saying；make
B.countered by saying；make for
C.opposed by saying；make up
D.have been lagged behind；slip off -
单项选择题
电力系统中一切不正常的相与相之间或相与地之间发生通路的情况称作（）。
A、短路
B、开路
C、工作接地
D、保护接地
