题目内容

下列除哪项外均为大气污染对健康的直接损害

A. 急性中毒
B. 机体免疫力下降
C. 致癌作用
D. 变态反应
E. 儿童维生素D缺乏病的发生增加

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肺炎抗感染治疗时,如何选择抗生素?

Manufacturers oppose retailers cutting prices on their goods mainly because they think_____.

A. retailers may eventually stop selling their products
B. it may reduce customers"confidence in their products
C. customers may feel uneasy when prices vary
D. it may sometimes lead to poor service

试述葡萄球菌肺炎胸片表现特点。

肺炎球菌肺炎与干酪性肺炎的鉴别要点;

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