当发现有可能是冒名顶替情况时，应对（）仔细查问，弄清情况。
A.随行人员
B.亲友
C.持证人
D.证件
参考答案：C
TCP service is obtained by having both the sender and the receiver create end points, which are called
A．network address
B．supernet address
C．socket
D．IP address
产品生命周期划分的依据是销售额和( )
A．利润 B．消费者爱好C．市场占有率 D．市场增长率
