- 搜標(biāo)題
- 搜題干
- 搜選項(xiàng)
單項(xiàng)選擇題
變壓器檔位采用哪種控制方式（）
A、direct-with-normal-security
B、sbo-with-normal-security
C、direct-with-enhanced-security
D、sbo-with-enhanced-security
