Areas of fertile soil called deltas, usually （） are formed by mud deposited at the mouth of a river. A: triangular in shape B: their shape is triangular C: they have a triangular shape D: triangular shape

The cake is ____ the shape of a heart.

已定义一个Shape抽象类，在此基础上派生出矩形Rectangle和圆形Circle类，二者都有GetPerim（）函数计算对象的周长，并编写测试main（）函数。class Shape{public:Shape(){}~Shape(){}virtual float GetPerim()=0;}

下列选项中的接口声明正确的是______。 A: interface Shape{...} B: abstract private interface Shape extends Area{...} C: private interface Shape{...} D: protected privated interface;

有形状类Shape，子类圆类Circle。执行语句Shape s = new Circle()；后， 以下哪个表达式能判断s是Circle的实例（ ） A: s is Shape B: s instanceof Circle C: s.instanceof Circle D: s instanceof Shape

Does art ______ society, or shape it?

Shape Sequence是顺序（）。

‌The classification and description of English vowels are based on ___________________.‎ A: the position of the tongue B: the shape of the lips C: the shape of vocal tract D: all of the above

通过设置Shape控件的( )属性可以绘制多种形状. A: Shape B: BorderStyle C: FillStyle D: Style

任务：针对不同几何图形计算周长与面积1、创建Shape类，提供两个方法double perimeter() —— 计算图形周长double area() —— 计算图形面积2、创建矩形类Rectangle继承Shape类包含双精度的长宽属性：a和b3、创建圆形类Circle继承Shape类包含双精度的半径属性：r4、创建ShapeCalculation类，提供两个方法double getPerimter(Shape shape); ——计算图形周长double getArea(Shape shape); ——计算图形面积5、创建TestShapeCalculation类实例化ShapeCalculation对象输入矩形长与宽，计算其周长与面积输入圆半径，计算其周长和面积