通常不会借助（）进行现场调研 Which of the following will not be employed in a field investig
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通常不会借助（）进行现场调研 Which of the following will not be employed in a field investigation（）
A．网上调研统计数据 Online investigation of statistic data
B．走访管理部门 To visit the local management department
C．走访企业 To visit the local enterprises
D．测试环境污染场所 To test pollutant concentration in environment
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