Regulations for the qualification test of per-welders
GB/T6419-1986潜水焊工考试规则
A protective plate covering the human face, as of a welder or per.
面罩盖在人脸上的保护罩，如熔焊工人的或潜水员的
That is also how submarines work.
潜水艇也是这样工作的。
Analysis of industrial water consumption level and water-saving potentialities in Shanxi Province;
山西省工业用水水平与节水潜力分析
navigable deep ping vessel for underwater exploration.
用于水下探测的航行用深潜水工具。
Forecasting and Conservation Potential Analysis of Industrial Water in Tianjin
天津市工业用水预测与节水潜力分析
Two pers work together while a standby per remains on the surface.
两名潜水员协同工作,同时有一名候补潜水员留在水面上。
Technological guide for assemble and welding of metal sporal case of turbine
水轮机金属蜗壳安装焊接工艺导则
Strengthening welder technical training process control,improving long-distance pipeline welding level
强化焊工技术培训过程控制,提高长输管道焊接施工水平
The act or an instance of submerging, as of a submarine or a skin per
潜水潜水的动作或例子；如潜水艇或裸潜者潜水
These pers work in sub-zero temperatures.
这些潜水员在零下的温度中工作。
Water Resources Argumentation of Tapping Potential of the Project of Diversion from Yellow River to Qingdao in Shandong Province;
山东省引黄济青工程挖潜水资源论证
Comprehensive Evaluation of the Effectiveness of Different Location Interception Project
不同位置截潜引水工程效果综合评价
lock-out submersible
可出舱潜水的潜水器
A Study on Treatment of Polluted Surface Water by Using Horizontal Subsurface Flow Constructed Wetlands;
水平潜流人工湿地净化受污染水体研究
The Study of the Phosphorous Removal in Horizontal Subsurface Flow Wetland Treating the Polluted Surface Water;
水平潜流人工湿地去除受污染水体中磷的研究
Water-saving Potential and Measures for Industry and Residents in Jinchang City;
金昌市工业和城镇居民节水潜力和节水措施
Drainage Gas Recovery Technique of Combing ESP and Gas Lift for Gas Wells with Large Water Production
大水量气井电潜泵—气举组合排水采气工艺设计