在滚轧棒坯上可能发现下列哪种缺陷？

Which of the following discontinuities might be found in rolled bar stock?

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在双金属连铸铜包铝复合棒坯试验中，出现不同过渡层的制品。

Bimetal copper-cladding aluminum bars with different transition layers were manufactured by continuous casting.

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被轧制和加工成为梁、棒、薄板的不锈钢产品，如方坯或厚板。

Stainless steel products such as blooms, billets, or slabs that are then rolled and processed into beams, bars, sheets, etc.

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