关于艾滋病的诊断要素中,最有意义的是()
A.高危人群
B.临床表现
C.抗HIV抗体
D.CD+/CD8+T淋巴细胞比值
E.机会性感染
参考答案:C
当a=1、b=3、c=5、d=4时,执行下面一段程序后,x的值为______。if (a<b) if (c<d) x=1; elseif (a<c)if (b<d) x=2;else x=3;else x=6;else x=7;
A.1
B.2
C.3
D.6
Everything()if Albert hadn't called the fire brigade.
A.will be destroyed
B.will have been destroyed
C.would be destroyed
D.would have been destroyed