A characteristic of adaptive immunity is ()
A. Redness
B. Inflammation
C. Lack of specificity
D. Memory
E. All of the above
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Humoral immunity refers to which of the following elements ()
Ab
B. Macrophages
Complement
D. A and C
E. All of the above
Cells participating in adaptive immunity are ()
A. NK cells
B. NKT cells
C. T cells
D. Macrophages
E. B-1 cells
关于循环的嵌套，说法不正确的是( )
A. 一个循环体内又包含另一个完整的循环结构,称为循环的嵌套
B. 内嵌的循环中可以再嵌套循环
C. while循环，do...while循环，for循环都可以互相嵌套
D. for循环的循环体不能再使用for循环
以下程序的输出结果是____?int main(){int i=2,p;p=f(i,i+1);printf("%d",p);}int f(int a,int b){int c;c=a;if(a>b)c=1;else if(a==b)c=0;else c=-1;return c;}
A. 0
B. 1
C. 2
D. -1
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