单选题：工程咨询单位的生命力来自咨询单位（　　）。

题目内容：

工程咨询单位的生命力来自咨询单位（　　）。 A．高质量的咨询服务
B．采用先进的工具和手段
C．专有知识的积累
D．严格的自律和严谨的作风

参考答案：

答案解析：

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