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【判断题】
05-5-19*核酸的紫外吸收与溶液的pH值无关。A.
正确
B.
错误
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举一反三
【单选题】The theme of “Mark Twain—Mirror of America” is _____.
A.
Twain’s personal experience and literary creation gives a true representation of America.
B.
Mark twain is one of America’s best-loved authors.
C.
Twain’s colorful personal experience exerted great impact on his writing.
D.
Twain’s novels are sure to be read and studied in America.
【单选题】下列不属于关系模型优点的是
A.
建立在严格的数学概念的基础之上
B.
概念单一，实体和实体间联系都用关系来表示
C.
存取路径对用户透明，具备更高的数据独立性
D.
查询效率高
【单选题】Mark Twain's Adventures of Huckleberry Finn Samuel Clemens, whose pen name is Mark Twain, publishes Adventures of Huckleberry Finn in 1885 in America. He has been at work for eight years on the story ...
A.
It was banned by many libraries as trash in the U.S.
B.
The book was attacked to be coarse and inappropriate.
C.
It was praised for its free-spirited and truthful hero.
D.
It was praised for the colorful stories it narrates.
【简答题】完成教材51页实训要求,并以附件形式上传作业,禁止抄袭! 附件以学号、姓名命名后上传!
【单选题】下列关于关系模型优点的描述，错误的是
A.
结构灵活，可满足所有用布尔逻辑运算和数字运算规则形成的询问要求
B.
能搜索、组合和比较不同类型的数据
C.
插入和删除数据不方便
D.
适宜地理属性数据的模型
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