插尿管需做尿培养者,用无菌标本瓶或试管接取()
A.前段尿,5m1
B.中段尿,5m1
C.末段尿,5m1
D.中段尿,3m1
E.末段尿,3ml
参考答案:B
高分子化合物的构型可分为线型和体型。
有以下程序:#include <iostream>#include <math>using namespace std;class pointprivate: double x; double y;public: point(double a, double b x=a;y=b; friend double distance (point a, point b ; ;double distance(point a, point b return sqrt((a. x-b. x )*(a. x -b. x )+ (a. x -b. x)*(a. x-b. x));int main () point p1(1,2); point p2(5,2); cout<<distance (p1, p2)<<end1; return 0; 程序运行后的输出结果是
A.1
B.5
C.4
D.6