服务与有形产品最重要的区别是（）。
A.不可储存性
B.无形性、不可触摸性
C.顾客在服务中的参与
D.生产与消费的不可分离性
参考答案：B
为研究某新法接生对新生儿窒息是否有作用，选择市级医院作为试验组，使用新法接生，县级医院为对照组，用普通接生法，该方案（）
A.可行
B.不可行，未使用盲法观察
C.不可行，样本含量太小
D.不可行，对照设立不当，可比性差
E.不可行，未设立对照
A client on prolonged bed rest has developed a pressure ulcer. The wound shows no signs of healing even though the client has received skin care and has been turned every 2 hours. Which factor is most likely responsible for the failure to heal
A．Inadequate vitamin D intake.
B．Inadequate protein intake.
C．Inadequate massaging of the affected area.
D．Low calcium level.
