Positioning Screw, Set Screw
right hand screw [= right handed screw]
screw hexagon socket head cap screw
air cored
无铁心的
空心的
直接硼氢化物燃料电池
直接硼氢化钠燃料电池(DBFC)
Air-Cored Cylindrical Coil
air-cored pulse transformer
concrete cored DCM pile
concrete-cored DCM pile
Concrete-cored Sand-gravel Pile
concrete-cored sand-gravel piles