您要查找的是不是：
- D类焊缝D-type weld
- C、D类焊缝C and D seam
- B类焊缝Welding seam Categories B
- 焊缝welding line
- 胺类amine
- 聚类分析cluster analysis
- 维生素Dvitamin(e)
- 角焊缝leg of a fillet weld
- 灵长类Primates
- 果类fruit
- 对接焊缝butt weld
- 类项category
- 布类mercery
- 第一类first kind
- 对焊缝金属凝固结晶扩散层厚度特征距离X_c=D_l/R理论意义的探讨APPROACH TO THE FEATURE DISTANCE xc = D1/R OF CRYSTALLIZATION DIFFUSION LAYER THICKNESS IN WELD METAL
- 蔬菜类greengrocery
- 脂类FAT
- 小类subclass
- 抽象类abstract class
- 醇类alcohols
