[说明] 计算下列源代码的McCabe环数,画出控制流程图并用罗马数字标出区域。 read x,y,z; type =“scalene”; if (x= =y or x = = z or y= = z)type =“isosceles ”; if (x = = y and x = = z) type =“equilateral”; if (x>= y+ z Or y>= x+20rz>=x+ y) type= “not a triangle”; if (x<=0 or y<= 0 or z <=0) type =“bad inputs”; print type;