砂型铸件上可能发现下列哪种缺陷？

Which of the following is a discontinuity which might be found in sand castings?

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在粘土砂型铸造生产过程中经常出现夹砂类缺陷。

In casting iron production casting iron scab flaw is often found.

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在粘土砂型铸造生产过程中经常出现夹砂类缺陷。

In casting iron production casting iron scab flaw is often found.

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