发布时间:2025-01-29 10:36:45
钢材密度按7850千克/立方米计算,
方通重量为:
(0.2X0.2-0.18X0.18)X1X7850
=59.66千克/米
=59.66公斤/米
急2006年买了一套越南黄花梨的圈椅3件套请专业人士帮忙看看是真的吗
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