单选题
发布日期:2021-03-22
evenly distrubuted vertically and the double bottoms are full
concentrated low and the double bottoms are empty
concentrated low and the double bottoms are full
concentration high and the double bottoms are empty
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数据库系统中的三级模式以及模式间的映像提供了数据的独立性。下列关于两级映像的说法,正确的是()。
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男,65岁,腰背部疼痛1月余,结合图像,最可能的诊断是( )
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一棵含有16个结点的完全二叉树,对他按层编号,对于编号为7的结点,他的双亲结点及左右结点编号为()。
人员配备原则以()为中心
利率降低将导致资本更加密集,资本一产量比率下降。()
浆砌片石护底适用于最大流速不超过()的山区或山前区。
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