．----What do you think of the teacher?

----She is a strict teacher , but____ all her students show respect for.

A．that

B．the one

C．who

D．one

动作逻辑关系应满足本体重瓦斯保护、主变断路器开关跳闸、（）同时动作时才能启动排油充氮保护。