第12题: [单项选择]有关试带法尿亚硝酸盐检测,错误的是() A. 阴性可排除菌尿 B. 阳性不能完全肯定泌尿系统感染 C. 标本污染偶氮染料可呈假阳性 D. 尿液维生素C浓度过高,可出现假阴性 E. 进食过多卷心菜或菠菜等,可出现假阳性 参考答案:A 答案解析:NIT检测受尿中致病菌是否存在硝酸盐还原酶、尿在膀胱内停留的时间是否足够长、尿中是否存在适量硝酸盐等因素的影响,且其结果阴性不能排除菌尿的可能,结果阳性也不能完全肯定泌尿系统感染。
第27题: [单项选择]Questions 19 to 22 are based on the conversation you have just heard. A. They are virtually impossible to enforce. B. Neither is applicable to the woman’s case. C. Both of them have been subject to criticism. D. Their requirements may be difficult to meet. 参考答案:D 答案解析:What does the man say about the two federal laws?