减少了石油井架的搬运次数。
竖起的油井架向欢呼的人群中喷洒着银色的纸屑。
An oil derrick showered silver confetti on the whooping crowd.
以设计、研究为重点,介绍了陆地石油井架的电算准则和方法。
Putting stress on design and research, the author introduces the criteria and procedure for onshore derrick design.
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