单选题：（　）既是注册消防工程师步人行业的“通行证”，又是具体行业立足的基础。

题目内容：
（　）既是注册消防工程师步人行业的“通行证”，又是具体行业立足的基础。 A．维护公共安全原则
B．诚实守信原则
C．依法执业原则
D．公平竞争原则

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答案解析：

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