若要集成运放工作在非线性区，则必须在电路中引入（）反馈或者在（）工作状态下。
参考答案：正；开环
Considering the boys around Tom a bad influence on him, his parents don’t like him ______ them.
A．corresponding with
B．fascinating with
C．associating with
D．conflicting with
个人购房贷款业务阶段性担保中介机构约定办妥抵押登记时间原则上不超过（）个月。
A、1
B、2
C、3
D、4
