28.下列系统中，适合采用逐步切换方式完成旧系统到新系统切换的是-湖北继续教育网网校

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[单选题]28.下列系统中，适合采用逐步切换方式完成旧系统到新系统切换的是

A电子邮件系统

B高速公路收费系统

C机场监控系统

D企业资源规划（ERP）系统

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