Given: function[img=34x25]17de81e321f7032.png[/img] has a second-order derivative within the interval of [img=8x19]17de81e32caa1a1.png[/img], and . Then, within the interval of , the curve is: A: increasing and convex upward B: decreasing and convex upward C: increasing and convex downward D: decreasing and convex downward

The section types of the main arch consist of slab arch bridge,rib arch bridge,double-convex arch bridge,and box arch bridge. A: 正确 B: 错误

下面函数定义中正确的是 。 A: double fun(double f1, double f2){ } B: double fun(double f1; double f2){ } C: double fun(double f1, double f2); { } D: double fun(double f1, f2){ }

以下函数定义中正确的是（）。 A: double fun(double x,double y){} B: double fun(double x;double Y){} C: double fun(double x,double Y);{} D: double fun(double X,Y){}

中国大学MOOC: public class Position{ double latitude; double longitude; public static double calDistance(double x1, double y1, double x2, double y2){ ...... } public static double calDirection(double x1, double y1, double x2, double y2){ ...... }}上述代码的设计是否合理？

下列函数声明语句正确的是？ A: double f(a,b); B: double f(double a, b); C: double f(a, double b); D: double f(double, double);

Mooncakes are created in handmade wooden molds that give them traditional shape. The convex patterns on mooncake are colorful, both in terms of art and cultural .

下列哪条语句正确？（ ） A: double snow[31]=new double[]; B: double snow[31]=new double[31]; C: double snow[]=new Double[31]; D: double[] snow=new double[31];

在C#中定义一个数组，正确的代码为 A: double A = new double[10]; B: double[] A = new double[10]; C: double A = new double(10); D: double A[10] = new double;

下列语句中错误的是( )。 A: double *p=new double(6); B: double *p=new double[6]; C: double *p=new double; D: double *p=new double[6](0);