核心提示：Cangzhou Hengtai Pipe Fitting Company Ltd.is the specialized production each kind of Stainless steel screwed pipe fitting, Casting fittings,press-fittings, screwed couplings,Pipe fittings, Pipe coupli
推荐简介：近些年黄龙玉的价格逐渐攀升，有越来越多的人都开始纷纷收藏黄龙玉，随着求购者需求的增多，市面上也出现了不少假的黄龙玉，那有什么仪器可以对黄龙玉的玉色是自然色，还是增强色进行鉴别呢？严格上来说，颜色没有真假，但是玉皮却有真假，用辅助仪器来判断玉色的手段常见的有三种：1.查尔斯滤色镜，又称祖母绿滤色镜，其分辨颜色有专门的颜色对照表可供参考。2.显微镜，一般用于观察玉石的表面特征，玉石内部接近表面的结构......
Cangzhou Hengtai Pipe Fitting Company Ltd.is the specialized production each kind of Stainless steel screwed pipe fitting, Casting fittings,press-fittings, screwed couplings,Pipe fittings, Pipe couplings,the valve and so _disibledevent="czhongtai.alibaba">czhongtai.alibaba
