单项选择题

取压管路中必须装有一次针形阀门的目的是【  】 A.
仪表投用、停止、更换时使用 B.
运行中取压管路有故障时用以切断压力 C.
隔离弹性元件免受介质高温加热    D.
便于加装密封填片

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