由圆桶状钢套及其端面侧壁伸出带一折的窄钢片，在窄钢片上固定有一根铜针。
A narrow steel sheet with one-folding extends out of a barrel-shaped steel jacket and the side wall of the end surface, and the narrow steel sheet is fixed with a bronze needle.
由圆桶状钢套及其端面侧壁伸出带一折的窄钢片，在窄钢片上固定有一根铜针。
A narrow steel sheet with one-folding extends out of a barrel-shaped steel jacket and the side wall of the end surface, and the narrow steel sheet is fixed with a bronze needle.
应用推荐