发布时间:2025-01-29 10:41:25
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
yeelight易来 ylsd0019 简约led射灯 4w 暖白光 灰色健康舒适照明
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