管道运输业的主体是管道，管道工程的核心工作是管口的焊接。
The subject of pipeline transportation is pipeline; the core of pipeline project is nozzle welding.
探讨了金属热喷涂防腐技术在管道运输业的应用领域及推广应用的策略。
It inquires into the domain of application, publicity and tactics of the metallic thermo spray in pipeline transportation.
这个集团在家电市场中也占有47%的份额，以及在管道运输业占有一半的市场份额。
The group also has a 47% share of the home-appliance market and half of the market for pipelines.
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