管道系统小修，需在局部管网短时间停止运行条件下进行修理的项目如（）。-查字典考试网

管道系统小修，需在局部管网短时间停止运行条件下进行修理的项目如（）。

A、更换法兰垫片和阀门
B、支、吊架螺栓的紧固
C、管道保温层的修整
D、压力表和安全阀更换

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