发布时间:2025-01-29 10:41:05
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
工程造价出来从事市政土建还有装饰装修哪个前景比较好我是一名女生现在不知道做哪类不叫好
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