b级 meaning in English
class b certification
Examples
- Hexagon flange bolts - heavy series - product grade b
六角法兰面螺栓加大系列细杆b级 - Examination for registration as a grade b electrical worker
B级电业工程人员注册考试 - Fasteners . threaded rods . product grades a and b
紧固件.螺纹杆. a和b级产品 - Hexagon slotted and castle nuts , style 1 - product grades a and b
1型六角开槽螺母a和b级 - Manhole tops classes a 15 and b 125 , circular ; summary
A级15和b级125圆形人孔顶部.综述