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当前学科：卷烟服务营销服务监控与评估
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客户询问是通过询问的方式向被调查者了解服务信息的一种方法，具体有：面谈调查、（）。
A . A、留置调查
B . B、电话调查
C . C、网络调查
D . D、邮寄调查
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