HIV感染主要损害人体的哪个系统()
A.神经系统
B.消化系统
C.循环系统
D.免疫系统
E.呼吸系统
参考答案:D
_____ John failed to climb to the top of the mountain several times, he didn't give up. [ ]
A. Although
B. Because
C. Whether
采用随机对照试验评价某中西医结合治疗糖尿病的效果,试验组糖尿病某种并发症的发生率为18%,对照组发生率为39%,症状性低血糖发生率试验组为46%,对照组35%,则
RRI()
A.21%
B.11%
C.54%
D.24%
E.9.1