变厚度圆(环)板
variable circular (annular) plate
高强度圆环链
high tensile round link chain
高强度圆柱齿轮
high strengthening cylindrical gear
激光椭圆度测量仪
laser ellipseness measuring instrument
矿用高强度圆环链
high strength mining round link chain
矿用高强度圆环链用钢
high tensile round link chain steel for mining