三级 – phrases

Terms for subject Oil / petroleum containing 三级 | all forms | in specified order only

Chinese	English
一级三角测量	first-order triangulation
三段式多级主轴涡轮钻具	triple-section multistage spindle turbodrill
三级变速箱	triple-change gear
三级密封式防喷器	blowout preventer of three stage packer type
三级旋风分离器	third stage cyclone separator
三级注水泥	three-stage cementing
三级泵	triple-stage pump
三级蒸馏	three stage distillation
污水三级处理	sewage tertiary treatment
第三级干涉色	third-order color (晶体光学特征)