Shrinkage and dispersed shrinkage are the special waster of ductile iron.
缩孔和缩松是球墨铸铁特有得废品现象。
There are defects such as wash, blowhole, dispersed shrinkage in the butterfly type valve.
蝶阀体铸件存在冲砂 气孔, 缩孔等缺陷。
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