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【单选题】
关系模式中2NF是指( )A.
满足1NF且不存在非主属性对候选码的传递函数依赖
B.
满足1NF且不存在非主属性部分函数依赖于候选码
C.
满足1NF且不存在非主属性
D.
满足1NF且不存在组合属性
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】一: 自己挑选一个对象,尽量与别人不同。 二:实现基本的增,删,查,改,排序,文件等功能。 三:自由发挥其它功能
【单选题】以下不是药物微囊化后特点的是
A.
缓释或控释药物
B.
使药物浓集于靶区
C.
提高药物的释放速率
D.
掩盖药物的不良气味及味道
E.
防止药物在胃内失活或减少对胃的刺激性
【单选题】42 The surey was focused on
A.
the liing conditions of older physicians in the U. S.
B.
the career plans of older physicians in the U. S.
C.
the retirement plans of older physicians in the U. S.
D.
the achieements of older physicians in the U. S.
【单选题】What did young people in like to wear? [ ]
A.
the 1990'
B.
1990s
C.
the 1990
D.
the 1990s
【简答题】A)The 1940s. B)The 1950s. C)The 1970s D)The 1980s.
【单选题】The figure given below shows a shift in the production-possibility curve of a country from AB to AC. Here, S 1 and C 1 are the initial production and consumption points respectively. S 2 and C 2 , on ...
A.
B.
C.
D.
D
【单选题】In medicine and law, the separation between being alive and dead cannot be _______________. It marks the point in time after which consequences occur, including no legal or medical requirement to prov...
A.
clear
B.
ambiguous
C.
accurate
D.
certain
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