题目内容

The medical word that means " a duct between the aorta and the pulmonary artery, which normally closes soon after birth, remains open" is ____. (three words)

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有下列程序输出结果是( )。#include main(){union{int k;char i[2];}*s,a;s=&a;s->i[0]=0x39;s->i[1]=0x38;printf("%x\n",s->k);}

A. 3839
B. 3938
C. 380039
D. 390038

设有以下定义typedef union{ long i;int k[5];char c;} DATE;struct date{ int cat;DATE cow;double dog;} too;DATE max;则语句printf("%d",sizeof(struct date)+sizeof(max));的执行结果是( )。

A. 25
B. 52
C. 18
D. 8

下列程序的执行结果为( )。struct s1{ char s;int i;struct s1 sip;}main(){ static struct s1 a[]={{"abcd",1,a+1},{"efgh",2,a+2},{"ijkl",3,a}};struct s1 *p=a;int i=0;printf("%s%s%s",a[0].s,p->s,a[2].sip->s);printf("%d%d",i+2,--a[i].i);printf("%c\n",++a[i].s[3]);}A. B.C. D.

A. abcd abcd abcd 2 0 e
B. abcd efgh ijkl 2 0 e
C. abcd abcd ijkl 2 0 e
D. abcd abcd abcd 2 1 e

由于抽样研究所致的样本指标与总体指标之间的差异,称为

A. 变异
B. 偏倚
C. 概率
D. 抽样误差
E. 假设检验