问题
单项选择题
连接动设备的螺纹连接管道一般要求DN在（）mm以下。
A、100
B、200
C、300
D、400
答案
参考答案：A
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连接动设备的螺纹连接管道一般要求DN在（）mm以下。
A、100
B、200
C、300
D、400
参考答案：A
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