播种五谷的是（） ["神农氏","燧人氏","伏羲氏"]
class A { public byte getNumber（） { return 1； } } class B extends A { public short getNumber（） { return 2； } public static void main（String args[]） { B b = new B（）； System.out.println（b.getNumber（））； } } What is the result？（） [" 1"," 2"," An exception is thrown at runtime."," Compilation fails because of an error in line 8."," Compilation fails because of an error in line 14."]
家庭治疗法
简述放射性污染对人体健康的影响。
Which two are benefits of fully encapsulating a class？（） [" Performance of class methods is improved."," Implementation details of the class are hidden."," Access modifiers can be omitted on class data members."," Code that uses the encapsulation class can access data members directly."," Internal operation of the class can be modified without impacting clients of that class."]
沙盘疗法
