新变压器设计采用无缺口的壶型核，其价格低且比有缺口的壶型核供货容易。
The new transformer design used an ungapped pot core that was less costly and easier to obtain than a gapped pot core.
目的：探讨壶腹癌中抑癌基因P16 蛋白与增殖细胞核抗原（PCNA）表达的相关性及其与肿瘤临床病理特征的关系。
Objective:To study the expression of P16 protein and PCNA in ampullary carcinoma and its relation with its pathological features.
因为壶型核沾了聚亚胺酯，不必要的缺口被永久固定了。
Because the pot core was dipped in polyurethane, the unwanted gap was permanently fixed.
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