an operating time setting circuit for setting the operating time of the electric leakage detecting circuit;

study on the corrosion rate of gas piping

煤气管道腐蚀速率的研究

a study of inspection technology for wall-thinning due to pitting corrosion in coal-gas pipeline

煤气管道点状腐蚀减薄检测技术探讨

treatment method on soft ground of gas pipeline

煤气管道软性地基的处理方法

remove the deposit in the coke oven pipe of negative pressure for as process

AS流程负压区煤气管道沉积物的清除

finite element analyses of spherical node of coal pipeline system of blast furnace

高炉炉顶煤气管道球形节点有限元分析

a design of coke oven reversing machine cock and oven heating gas pipe

炼焦炉交换旋塞与加热煤气管道的设计

design and realization of remote information exchange system of gas pipeline inspection robot

煤气管道机器人远程信息交换系统的设计与实现

but back to the gas man's question.

然而还是让我们回到那位煤气管道修理工问的问题吧。

application of fast assembling pipe fittings in rush-repair and construction of gas pipeline

快装管件在煤气管道抢修及施工中的应用衬塑给水管及管件

cathodic protection practice of used urban gas pipeline in service

城市在役旧煤气管道的阴极保护研究及实践

a preliminary analysis on electrochemistry corrosion and anti-corrosion measures of coal pipes

煤气管道的电化学腐蚀与防腐蚀措施浅析

pipe-diameter adapting and adjusting mechanism of gas pipeline inspection robot

煤气管道机器人管径适应调整机构分析

application of fibreglass epoxy wrapping in strengthening of gas pipes

玻璃钢包扎在煤气管道加强上的应用

application of novel thermal insulation materials in condensate drainers on gas pipes

新型保温材料在煤气管道冷凝水排放器上的应用

the usage of adding shorten pipe to original gas pipe in ironmaking

荒煤气管道增设缩径管在炼铁生产中的应用

improvements on the welding process for piping within city gas distribution plant

煤气管道工程站场焊接工艺的改进

gas pipeline inspection robot video coding system based on fractal approach

基于分形理论的煤气管道机器人视频系统

way to apply indoor manufactured gas pipe lines to natural gas

室内煤气管道如何适用于天然气

calculation of the permission pressure drop for gas line pressure test

煤气管道试压中允许压力降的计算

application of high efficient epoxy adhesive in repairing of gas piping

高效环氧胶粘剂在煤气管道修补中的应用