发布时间:2025-01-31 14:16:02
约10千克。
10号槽钢的理论重量10.007 (kg/m),截面积12.784 (cm^2)
摘自 GB/T 707-1988
崖柏手串怎么盘,每天盘多长时间,放多长时间,求大神给详细的方法
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