相关考题
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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 -
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
