某呼吸内科某年上半年收治300例肺炎病人,治愈250例,治愈率83.33%;下半年收治肺炎病人306例,治愈280例,治愈率91.5%则全年肺炎治愈率为()
A.(250+280)/(300+306) B.(83.33%+91.50%)/2 C.83.33%×(300+306) D.91.50%×(300+306)正确答案A
某呼吸内科某年上半年收治300例肺炎病人,治愈250例,治愈率83.33%;下半年收治肺炎病人306例,治愈280例,治愈率91.5%则全年肺炎治愈率为()
A.(250+280)/(300+306) B.(83.33%+91.50%)/2 C.83.33%×(300+306) D.91.50%×(300+306)正确答案A