镀黄铜圆头软钢机器螺丝
brass-plated mild steel round head machine screw
优质铁精矿
Fine quality iron concentrate
永磁铁氧体磁粉
hard ferrite magnetic powder
永磁铁氧体
permanent ferrites material
permanent ferrite
ferroxdure
permanent magnet ferrites
permanent-magnetic ferrite
magnetic ferrite
permanent magnetic ferrite
Hard ferrite
permanent magnet ferrite
permanetnt ferrite
hard ferrite material
permanent ferrites
hard ferrites
Permanent ferrite magnet
永磁铁磁导率
permeability of permanent magnet
荧光铁载体
wave scan
ultraviolet photography technique
英国铁路电信
BRT British Rail Telecommunications