单层钢结构安装工程中,地脚螺栓(锚栓)露出长度的允许偏差为()。

A.+30.Omm,0.0mm B.+20.Omm,0.0mm C.+50.Omm,0.0mm D.+30.Omm,5.0mm

时间:2023-10-08 13:46:41

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