An oil derrick is a necessary supporting frame, and plays an important role in oil production.

采油井架钢结构是钻采石油时所必需的支架结构，对油田生产起着重要作用。

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An oil derrick is a necessary supporting frame, and plays an important role in oil production.

采油井架钢结构是钻采石油时所必需的支架结构，对油田生产起着重要作用。

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