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口腔颌面部的恶性肿瘤以癌为常见，肉瘤较少。癌肿中绝大多数为鳞状细胞癌，其次为腺性上皮癌，还有基底细胞癌、未分化癌、淋巴上皮癌等。
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or $category['dir'] == 'shenjingmeidu' or $question['id'] == '300855'}
