发布时间:2025-01-29 10:38:39
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
装修时多媒体集线箱里没有装插座幸好留有电源线现在需要安装个插座懂得说说
2025-01-29 10:38:39 2025-01-29 10:38:39 2025-01-29 10:38:39 2025-01-29 10:38:39 2025-01-29 10:38:39 2025-01-29 10:38:39