试题与答案

婴幼儿血维生素A水平低于多少μg/L即构成维生素A缺乏症()。 A.100 B.20

题型:单项选择题 A1型题

题目:

婴幼儿血维生素A水平低于多少μg/L即构成维生素A缺乏症()。

A.100

B.200

C.300

D.400

E.500

答案:

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真理是具体的。 真理是有条件的。(答对一点得3分,答对两点得5分)题目分析:该题考查学生对课本所学知识的理解和运用,材料选择课本,容易理解,难度不大。以三角形内角之和的认识理解真理是相对的、有条件的...

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