【单选题】--- Did you tidy your room? --- No, I was going to tidy my room but I ______ visitors.
【单选题】When I ______ my senses, I found myself wrapped up in bed in my little room, with Grandma bending over me.
【单选题】戴维南定理实验测量等效内阻R0时,用万用表电阻挡的正确操作是?
A.
关闭电路的电源,用万用表红黑表笔测量b,e两端。
B.
关闭电路的电源 ,开关S1,S2搬向短路线一侧, 用 万用表 红黑表笔测量b,e两端 。
C.
关闭电路的电源 ,开关S1,S2搬向短路线一侧,断开be支路, 用 万用表 红黑表笔测量b,e两端 。