The three elements of design flood are A: the design flood standards, the design flood volumn and the duration of design flood B: flood peak discharge, total flood volumn and flood hydrograph C: design flood peak discharge, one-day and three-day flood volumn D: design flood peak discharge, total design flood volumn and design flood hydrograph

下列程序的输出结果为 class Box{ int length,width,height; public void setInfo(int l,int w,int h){ length = l; width = w; height = h; } public int volumn(){ return length*width*height; } public int area(){ return (length*width + length*height + width*height) * 2; } public String toString(){ return "Length:" + length + " width:" + width + " height:" + height + " volumn: " + volumn() + " area:" + area(); }} public class BoxTest { public static void main(String[] args) { Box b = new Box(); b.setInfo(5,2,4); System.out.println(b.toString()); }}

大数据的特征不包括（）。 A: Volumn（数据量大） B: Variety（数据种类多） C: Value（数据价值密度低） D: Vague（数据模糊）