什么是类变量?什么是实例变量?类变量有什么特点?
在定义成员变量时,用关键字static修饰的是类变量;没有用关键宇static修饰的是实例变量;类变址是类的所有对象共享的成员变量。
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Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
A ( ) doesn't fire cannons to call attention to its shining; it just shines. (house, light)
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