中性点接地的作用是:()
A.可迅速切断故障设备电源
B.可降低系统故障时的人体接触电压
C.线路可以短时运行
D.可降低电气设备绝缘要求
参考答案:A, B, D
10个月男孩,混合喂养,未添加辅食。1个月来皮肤、黏膜逐渐苍白,不爱活动。肝肋下3cm,脾肋下1cm可触及。血红蛋白81g/L,红细胞3.4×10/L,血小板150×109/L。
为明确贫血性质,最简便的辅助检查是()
A.血涂片检查红细胞形态
B.血清铁蛋白测定
C.Hb分析
D.骨髓涂片检查可染铁
E.网织红细胞计数
Questions 16 to 20 are based on the following talk.
A. They get sudden attacks of sleep any time any place. B. They are mostly students enrolled in 8 A.M. classes. C. They are not easily cured if narcolepsy is diagnosed. D. They often sit at a table and their faces fall into a soup.