单项选择题
A、辅助开关B、真空灭弧室C、波纹管D、操动机构
Their government said that they had to use force to mai...
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；makeB.countered by saying；make forC.opposed by saying；make upD.have been lagged behind；slip off
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
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
若测得某稳压二极管的反向电流小于稳压管的最小工作电流，则该稳压管处于（）。A.正向导通区B.反向截止区C.反向...
单项选择题若测得某稳压二极管的反向电流小于稳压管的最小工作电流，则该稳压管处于（）。
A.正向导通区B.反向截止区C.反向击穿区D.放大区
