希瑟来负责这项工程时，人人都松了一口气。
It was a great relief when Heather arrived and took charge of the project.
石油和天然气、煤炭、可再生能源和工程机械领域合作。
Joint venture in oil, natural gas, coal, regenerated energy and mechanical engineering areas.
气藏物质平衡方程序，是气藏工程中的重要方法。
Material balance equation of gas reservoir is an important method in gas reservoir engineering.
气藏物质平衡方程是气藏工程中的重要方法。
Material balance equation for gas reservoir is an important method in gas reservoir engineering.
本发明涉及一种动力工程领域中的天然气发动机。
This invention relates to a natural gas engine for the dynamical engineering area.
本发明涉及一种动力工程领域中的天然气发动机。
This invention relates to a natural gas engine for the dynamical engineering area.
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