1860 MPa grade PC strand
1st grade clean operating room
Ⅱb type gem grade diamond
3(superscript rd) Grade mathematics
Ⅲ grade hot-rolled ribbed bar
400 MPa Ⅲ Grade Reinforced Bar
400 MPa Ⅲ grade reinforcing steel
400 MPa grade ultrafine gaind steel
400MPa grade reinforced bar
500kV voltage grade substation