发布时间:2025-02-07 00:05:18
你是做的简单的建筑模型吧,要求模型在几百面左右的那种,其实这种模型的价格应该是200块左右一个,但是经过很多人转手,价格就比较低了,落到学生手里可能就小几十块钱,而其中的利润都被转手的人得到了。
帽石是指涵洞端翼墙顶部前沿伸出墙面5厘米左右的那部分混凝土帽石的作用是什么
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