发布时间:2025-01-16 11:06:06
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
父母房子重新装修准备安装中央空调有知道日立和大金哪款噪音小吗
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