发布时间:2025-01-24 17:55:42
1、直射的照玉石强光手电筒渐渐平移时,可判定玉石质地结构是否均匀。照玉石强光手电筒平移时,玉石的透光性均匀阐明结构均匀,透光性不均匀,阐明玉石的结构均匀性欠好。
2、用手电筒鉴别玉石手镯正面打光直射在翡翠表面贴90度手电筒,缓慢移动手电筒,检查光圈大小,判断翡翠内部透光率,是制作正灯的重要用途。
3、手电筒是鉴定玉石是最常用的工具,手电筒的强光角度不同、强光源离玉石远近不同,照射方式不同得到的鉴定结果也不同。
9m定尺的钢筋36m标准层层高请问框架柱直径25的纵向钢筋如何下料损耗率最底浪费最少求施工高手
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