单选题The length of a rectangle is 5 more than the side of a square, and the width of the rectangle is 5 less than the side of the square. If the area of the square is 45, what is the area of the rectangle?A 20B 25C 45D 50E 70

使用RECTANGLE命令绘制一个矩形，并使该矩形具有厚度为100。正确的方法为()。

A.用RECTANGLE命令先绘一个矩形，然后用ELEV命令设置厚度为100

B.用ELEV命令设置厚度为100，然后用RECTANGLE命令绘制矩形

C.用RECTANGLE命令先绘一个矩形，然后用CHANGE命令改变厚度为100

D.在RECTANGLE命令中先设置其厚度为100，然后再绘制矩形

E.用RECTANGLE命令先绘一个矩形，然后再用RECTANGLE命令设置厚度为100

( ) looking at the positive side of life, he always pays attention to the negative side,

A、More than

B、Except for

C、Except

D、Rather than

阅读以下说明和Java源程序，将应填入(n)处的字句写在答题纸的对应栏内。

说明

以下程序的功能是计算三角形、矩形和正方形的面积并输出。

程序由5个类组成：AreaTest是主类，类Triangle、Rectangle和Square分别表示三角形、矩形和正方形，抽象类Figure提供了一个计算面积的抽象方法。

程序

public class AreaTest{

public static void main(String args[]){

Figure[]figures={

new Triangle(2,3,3)，new Rectangle(5,8)， new Square(5)

}；

for(int i=0；i＜figures．1ength；i++){

System.out.println(figures[i]+"area="+figures[i]．getArea())；

}

}

}

public abstract class Figure{

public abstract double SetAJea()；

public class Rectangle extends (1) {

double height;

double width;

public Rectangle(double height,double width){

this.height=height;

this.width=width;

}

public String toString(){

return "Rectangle:height="+height+",width="+width+":";

}

public double getArea() { return (2);

} } public class Square extends (3) {

public Square(double width) {

(4);

}

public String toString() {

return "Square:width="+width+":";

} } public class Triangle extends (5). {

double la;

double lb;

double lc;

public Triangle(double la,double lb,double lc) {

this.la=la; this.lb=lb; this.lc=lc;

public String toString(){

return "Triangle: sides="+la+","+lb+","+lc+":";

public double getArea() {

double s=(la+lb+lc)/2.0;

return Math.sqrt(s*(s-la)*(s-lb)*(s?1c))；

}

}

使用VC6打开考生文件夹下的工程test1_1，此工程包含一个源程序文件test1_1．cpp，但该程序运行有问题，请改正main函数中的错误，使该程序的输出结果如下：

Constructor called.

Default constructor called.

Area is 6

Area is 0

Area is 6

源程序文件test1_1,cpp清单如下：

include＜iostream.h＞

class RectAngle

{

private:

double ledge,sedge;

public:

RectAngle()

{

cout＜＜"Default constructor called.";

}

RectAngle(double l,double s)

{

ledge=l;sedge=s;

cout＜＜"Constructor called.";

}

void Set(double l,double s)

{

ledge=l;sedge=s;

}

void Area()

{

cout＜＜"Area is"＜＜ledge*sedge＜＜endl;

}

};

void main()

{

／***************** found *****************／

RectAngle Rect1(2,3);

RectAngle Rect2(1);

／**************** found *****************／

RectAnglC Rect3;

Rectl.Area();

／***************** found *****************／

RecL2.lodge=0;Rect2.sedge=0;

Reck2.Area();

Rect3.Area();

}

China’s space station, ________ three capsules and covering an area of no less than 60 square meters, will be completed within 10 years.

A、making up of

B、made up

C、consisted of

D、consisting of

阅读以下说明和C++代码，填入(n)处。

[说明]

以下C++代码使用虚函数实现了同一基类shape派生出来的Class rectangle、Class triangle、Class circle实现了计算矩形、圆形面积的计算。仔细阅读以下代码，将(n)处语句补充完整。

[代码5-1]

include＜iostream.h＞

define PI 3.14159

class shape {//基类

protected：

(1)；

public：

(2)；

(3)；

}；

[代码5-2]

class rectangle: public shape {

public:

rectangle (int x2,int y2,int r2): (4) {};

double area ( ) {return x*y; };

};

class circle: public shape {

public:

circle (int x3,int y3,int r3):(5){};

double area ( ) {return r*r*PI; };

};

[代码5-3]

void main ( )

{

rectangle r (10,20,0);

circle c (0,0,30);

shape (6)；

cout＜＜"长方形面积="＜＜s1-＞area ( ) ＜＜endl；

cout＜＜"圆形面积="＜＜s2-＞area ( ) ＜＜endl；

}

[运行结果]

长方形面积=200

圆形面积=2827.43

下列程序的执行结果为【 】。

include ＜iostream. h＞

class Point

{

public:

Point(double i, double j) { x=i; y=j;}

double Area() const { return 0.0;}

private:

double x, y;

};

class Rectangle: public Point

{

public:

Rectangle(double i, double j, double k, double 1)

double Area() const {return w * h;}

private:

double w, h;

};

Rectangle: :Rectangle(double i, double j, double k. double 1): Point(i,j).

{

w=k, h=1

}

void fun(Point &s)

{

cout＜＜s. Area()＜＜end1;

}

void main( )

{

Rectangle rec(3.0, 5.2, 15.0. 25.0);

fun(rec)

}

阅读以下说明和C++程序，将应填入(n)处的字句写在对应栏内

[说明]

以下程序的功能是计算三角形、矩形和正方形的面积并输出。

程序由4个类组成：类Triangle，Rectangle和Square分别表示三角形、矩形和正方形；抽象类Figure提供了一个纯虚拟函数getArea()，作为计算上述三种图形面积的通用接口。

[C++程序]

include＜iostream.h＞

include＜math.h＞

class Figure{

public:

virtual double getArea()=0; //纯虚拟函数

};

class Rectangle: (1) {

protected:

double height;

double width;

public:

Rectangle(){};

Rectangle(double height,double width){

This-＞height=height;

This-＞width=width;

}

double getarea(){

return (2);

}

};

class Square: (3)

public:

square(double width){

(4);

}

};

class triangle: (5) {

double la;

double lb;

double lc;

public:

triangle(double la,double lb,double lc){

this-＞la=la;thiS-＞ib;this-＞lc;

}

double getArea(){

double s=(la+lb+lc)/2.0;

return sqrt(s*(s-la)**(s-lb)*(s-lc));

}

};

viod main(){

figure*figures[3]={

new triangle(2,3,3),new Rectangle(5,8),new Square(5)};

for(int i=0; i＜3;i++){

cout＜＜"figures["＜＜i＜＜"]area="＜＜(figures)-＞getarea()＜＜endl;

}

}

};