以下哪一项可以降低输血过敏反应的发生率

A．减慢输血速度

B．选用一次性输血器

C．采用无热源技术配置保存液

D．选用洗涤红细胞

E．严格清洗、消毒采血和输血用具

有以下程序#includemain(){FILE * fp；int k , n,a[6]={1,2,3,4, 5,6}；fp=fopen("d2.dat","W")；fprintf(fp,"％d％d％d＼n",a[0],a[1],a[2])；fprintf(fp,"％d％d％d＼n",a[3],a[4],a[S])；fclose(fp)；fp=fopen("d2.dat","r")；fscanf(fp,"％d％d",&k,.&n)；printf("％d％d＼n",k,n)；fclose(fp)；} 程序运行后的输出结果是【 】。

A．12

B．14

C．1234

D．123456