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【单选题】
所谓范式是指规范化的关系模式。由于规范化的程度不同，就产生了不同的范式。在对关系模式进行规范化的过程中，对1NF关系进行投影，将消除原关系中的( )，从而产生、组2NF关系。A.
非主属性对码的传递函数依赖
B.
非主属性对码的部分函数依赖
C.
主属性对码的部分和传递函数依赖
D.
非平凡且非函数依赖的多值依赖
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举一反三
【单选题】The Mayan calendar far more accurate than the European calendars of the time most probably because ______.
A.
the Mayan numbers enabled the Mayan priests to study planets
B.
the European countries had no interest in founding a calendar
C.
the European calendars of the time probably were made by a guess work
D.
the year was divided into 18 months of 20 days each with five days left over
【单选题】This article is mainly about ______.
A.
the Mayan calendar and the ancient Mayan buildings
B.
the Mayan Indians and the Mayan calendar
C.
the intelligent Maya and their many achievements
D.
the ancient Mayan cities and temples
【单选题】What can be inferred about the Mayan culture?
A.
Mayan civilization began to decline around 900 AD.
B.
Historians are not sure about the reason for the decline.
C.
The study of Mayan civilization has become very popular now.
D.
Mayan civilization will flourish again in the future.
【单选题】患儿,女,1岁,母乳喂养,未加辅食,近1个月来患儿出现皮肤、面色苍黄,表情呆滞,反应迟钝,少哭不笑。入院后检查发现肝脾轻度肿大,血红蛋白为70g/L, 血清维生素B1290ng/L,血清叶酸3.5μg/L。针对该患儿的治疗措施,正确的是:
A.
口服铁剂+维生素C
B.
深部肌肉注射铁剂
C.
输血
D.
肌内注射维生素B12+口服叶酸
E.
肌内注射维生素B12
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