19. ÇëÔĶÁÒÔϳÌÐò:#include main() {float a,b scanf("%f",&a); if (a<0.0) b=0.0; else if((a<0.5) &&(a!=2.0)) b= 1.0/(a+2.0); else if(a<10.0) b= 1.0/x ; else b=10.0; printf("%f\n",y); } ÈôÔËÐÐʱÊäÈë2.0(»Ø³µ),ÔòÉÏÃæ³ÌÐòµÄÊä³ö½á¹ûÊÇ( )
A. 0.000000
B. 0.500000
C. 1. 000000
D. 0.250000
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