地铁衬砌
Lining Structure of Metro
压杆轴支撑衬铁
press lever shaft step liner
Y型平面六角铁氧体
Y type planar hexagonal ferrite
Y type hexaferrite
Y-type hexaferrites
阿里山铁角蕨
Asplenium arisanense Tagawa
北京铁角蕨
Asplenium pekinense Hance
扁铁及三角铁切割机
flat iron and angle iron cutting machine