“主键”不允许取重复值,是指( )。A.实体完整性约束规则 B.引用完整性约束规则 发布时间:2017-12-12 14:51 │ 来源:www.tikuol.com 题型:单项选择题 问题: “主键”不允许取重复值,是指( )。A.实体完整性约束规则B.引用完整性约束规则C.用户自定义完整性约束规则D.数据完整性约束规则
题型:单项选择题 患者男,23岁,因“皮肤紫纹、血压升高8个月,向心性肥胖3个月”来诊。查体:BP145/95mmHg;典型皮质醇增多症体征。实验室检查:空腹血糖7.0mmol/L,血钾3.5mmol/L,钠142mmol/L;过夜小剂量地塞米松抑制试验:血F(8AM):服药前28.79μg/dl,服药后23.01μg/dl;血ACTH84.6~85.6pg/ml。这一结果提示(提示:岩下静脉插管取血的结果如下左岩下静脉右岩下静脉左颈内静脉右颈内静脉外周静脉PRL(ng/ml)12.5196.212.514.412.4ACTH(pg/ml)122133116112110)()。A.库欣病B.异位ACTH综合征C.垂体右侧可能有分泌ACTH的微腺瘤D.垂体右侧可能有分泌PRL的微腺瘤E.原发性色素结节性肾上腺皮质病F.垂体性皮质醇增多症 查看答案
题型:单项选择题 —I'll never understand how it _____ that he still insisted on going there alone after being told about the possible danger.—Don't worry. He just likes taking adventure.[ ]A. came about B. came acrossC. came out D. came up 查看答案