在进行话务预测时必须根据（）来调查和收集有有关历史和现状的资料，并进行研究分析。
参考答案：话务预测的目的
An 20-month-old with acquired immunodeficiency syndrome (AIDS) is seen in the clinic for health maintenance. Which of the following vaccines would the nurse anticipate administering to this toddler
A. Diphtheria-tetanus-acellular pertussis.B. Varicella.C. Measles, mumps, and rubella.D. Hemophilus influenz
在动脉中流动脉血，在静脉中流静脉血．______．
