Because of climatic changes and new tectonic movements, several sea and land evolutions occurred in the Bohai sea area to result in the formation of subsurface brine.
由于气候变化和新构造运动，渤海曾发生多次海陆演化，从而形成了第四纪地下卤水。
Through further analyzing the conditions of subsurface blowhole formation and optimizing the technology conditions, the subsurface blowhole defect was eliminated.
进一步分析球墨铸铁活塞环皮下气孔的形成条件，通过优化主要工艺参数，达到防止皮下气孔的出现。
Through further analyzing the conditions of subsurface blowhole formation and optimizing the technology conditions, the subsurface blowhole defect was eliminated.
进一步分析球墨铸铁活塞环皮下气孔的形成条件，通过优化主要工艺参数，达到防止皮下气孔的出现。
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