《从军行》
class BaseClass{ private float x= 1.0f； protected void setVar （float f） {x = f；} } class SubClass extends BaseClass { private float x = 2.0f； //insert code here 16. } Which two are valid examples of method overriding？（） [" Void setVar（float f） {x = f；}"," Public void setVar（int f） {x = f；}"," Public void setVar（float f） {x = f；}"," Public double setVar（float f） {x = f；}"," Public final void setVar（float f） {x = f；}"," Protected float setVar（） {x=3.0f； return 3.0f； }"]
狭义环境质量调控
《饮酒》
Which statement about static inner classes is true？ （） [" An anonymous class can be declared as static."," A static inner class cannot be a static member of the outer class."," A static inner class does not require an instance of the enclosing class."," Instance members of a static inner class can be referenced using the class name of the static inner class."]
简述水力侵蚀的基本类型？
