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【单选题】
关于ER图的叙述正确的是______。A.
ER图是建立在关系数据库的假设上
B.
ER图可将现实世界中的信息抽象地表示为实体以及实体间的联系
C.
ER图使应用过程和数据的关系清晰
D.
ER图能表示数据生命周期
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【单选题】下列关于冠状动脉的概念错误的是
A.
左冠状动脉分支为左前降支和左旋支
B.
冠状动脉血流在收缩期最多
C.
窦房结多数由右冠状动脉供应血液
D.
冠状动脉血流最终回流汇集到冠状静脉窦
E.
冠状动脉有丰富的固有侧支循环
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【简答题】完形填空。 Jenny, an ll-year-old American girl, spent the Spring Festival with her parents in China. Her 1 planned a good old-fashioned (老式的) Spring Festival celebration:a dinner of Peking duck 2 by watchi...
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【简答题】u04p32.mp3: 2. Who is Alice most probably speaking to? ☐ A. s. ☐ B. Customers. ☐ C. Colleagues.