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【单选题】
数据库系统的三级模式是指:A.
用户模式、局部模式和全局模式
B.
外模式、概念模式和逻辑模式
C.
外模式、内模式和存储模式
D.
用户模式、概念模式和存储模式
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反馈参考答案：
举一反三
【简答题】输卵管由内侧向外侧分为 、 、 和 四部。
【简答题】A couple from Minneapolis decided to go to Florida for a long weekend to warm themselves up during one particularly icy cold winter. They planned to stay at the very same hotel where they spent their ...
【简答题】Twenty years ago, I was told a story of Little Brother at a party which has delighted and inspired me ever since. Little Brother, who was an ambitious painter and trying to be an artist, went to Franc...
【简答题】Alfred Alder, a famous psychiatrist, had an interesting experience. When he was a small boy he got off to a poor start in arithmetic. His teacher got the idea that he had no ability in arithmetic, and...
【单选题】关于肿瘤分级的描述不正确的是
A.
恶性肿瘤的分级是描述其恶性程度的指标
B.
肿瘤的组织学级别越高，恶性度越低
C.
肿瘤的分级是制订治疗方案和估计预后的重要指标之一
D.
高分化肿瘤一般不发生转移
E.
肿瘤分级的主要依据：肿瘤的分化程度、异型性和核分裂象的数目
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