单选题：职业健康安全管理体系标准的结构系统，采用PDCA动态循环、不断上升的螺旋式运行模式，这体现了（　　）的动态管理思想。

题目内容：
职业健康安全管理体系标准的结构系统，采用PDCA动态循环、不断上升的螺旋式运行模式，这体现了（　　）的动态管理思想。 A．持续改进
B．全过程控制
C．预防为主
D．系统管理

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