瓷绕线管绝缘子
porcelain bobbin insulator
X80电阻焊管线管
X80 grade electric resistance welding linepipe
超高强度管线钢
super-high strength pipeline steel
ultra high-strength pipeline steel
extra-high strength pipeline steel
超高强度管线钢管
ultra-high strength line pipe
车钩中心线高度
height of coupler center from top of rail
船舶的重心距基线高度
height of the center of gravity above the base line