... metallic hollow O-ring 金属空心O型环 Near-closed Hollow Ring 封闭型腔 metallic hollow O-ring for selfseal 自紧式金属空心O形环 ...
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near-closed hollow ring
近闭空心环
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The resin sand with high collapsibility is chosen to make the core of the near closed hollow ring on the basis of many technological experimentations through analysis of structure and process.
通过结构分析和工艺分析，在大量工艺试验的基础上，选用高溃散性树脂砂制作型芯，并成功地研制出大型薄壁复杂结构的封闭型腔铸件。
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