题目内容

低压镀锌钢管丝接（）以内管卡已包括。

A. DN32
B. DN25
C. DN15
DN50

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室内DN32以内钢管安装包括管卡及托钩制作安装，DN32以上的钢管的管卡等需另列项计算。

A. 对
B. 错

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