1. Indicates concave, convex or flush welds. Increase height to fit above other weld symbol. 指示凹焊缝、凸焊缝或平焊。增加高度以配合其他焊接符号。
2. Drag onto the page to add concave, convex, or flush welds. Increase height to fit above other weld shapes. 拖到绘图页后，可以添加凹焊缝、凸焊缝或平焊。增加高度以配合其他焊接形状。
3. Exploration of Multimedia Teaching Design on Foundation Physics "Science Inquisition" ——Convex Imaging Rule in Multimedia Teaching Design. 基础物理“科学探究”多媒体教学设计探索——凸透镜成像规律多媒体教学设计。
