发布时间:2025-01-16 12:48:28
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
海信电视LED42K560x3D电视重装系统黑屏了怎么办,求救!
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