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【单选题】
数据库系统在三级模式中提供了两次映像:外模式到模式的映像和模式到内模式的映像,而这两次映像就实现了数据库中数据两个层次的独立性,即( )A.
物理独立性和应用物理独立性
B.
逻辑独立性和物理独立性
C.
数据独立性和物理独立性
D.
应用物理独立性和逻辑独立性
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A.
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B.
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A.
乳房纤维腺瘤
B.
乳腺囊性增生病
C.
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D.
乳癌
E.
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