建立与维护消费者信息库包括哪些步骤？
参考答案：
包括四个步骤：消费者样本抽取、信息库内容确定、消费者信息采集和信息库维护。
--- Tom wants to know_____________.
--- I don't know, either. He said he would phone me as soon as he came back.
A．when Dad comes back
B．when did Dad come back
C．when Dad will come back
D．when does Dad come back
在战争时期，中立国和交战国都承担着（）义务。
A.不作为
B.帮助
C.防止
D.容忍
E.利用
