麻烦确认这道GWD的答案，多谢！

alieleanor

Because visual inspection cannot reliably distinguish certain skin discolorations from skin cancers, dermatologists at clinics have needed to perform tests of skin tissue taken from patients.  At Westville
                Hospital, dermatological diagnostic costs were reduced by the purchase of a new imaging machine that diagnoses skin cancer in such cases as reliably as the tissue tests do.  Consequently, even though the machine is expensive, a dermatological clinic in Westville is considering buying one to reduce diagnostic costs.

 

Which of the following would it be most useful for the clinic to establish in order to make its decision?

 

1. Whether the visits of patients who require diagnosis of skin discolorations tend to be shorter in duration at the clinic than at the hospital

2. Whether the principles on which the machine operates have been known to science for a long time

3. Whether the machine at the clinic would get significantly less heavy use than the machine at the hospital does

4. Whether in certain cases of skin discoloration, visual inspection is sufficient to make a diagnosis of skin cancer

5. Whether hospitals in other parts of the country have purchased such imaging machines

 

soniashi

不知道是什么啊？

是不是d啊？

liubin1987

正确答案是C.

大医院敢买这样的贵仪器,是因为它可以通过大量的病人的就诊来弥补成本,而后面说的那个小诊所如果也采取同样的策略,当很少有人使用这个仪器时,自然不能弥补成本,所以这个策略也就不好了.

如上所述,对C取非,则不能得出结论,所以选C

hollyball

支持c

clinic和hospital的对比