a lance with two points
accelerated melting by coal oxygen lance
air lance
空气吹灰枪
恒电位
用空气清除
恒定势
空气喷管
空气吹灰器
吹管
Ausmelt top submerged lance converting furnace
axis system dynamic ba- lance
back draught oxygen lance
Carbon oxygen Injecting Lance
Coherent Jet Oxygen Lance
construction of coal lance