毛茸茸的外国老祖母

The principle of opening and closing means opening to expansion and closing to modification. When the program needs to be expanded, the original code cannot be modified, but the original code should be expanded to achieve a hot plug effect. Therefore, a summary of one sentence is: in order to make the program scalable, easy to maintain and upgrade. To achieve this effect, we need to use interfaces and abstract classes, etc. We will mention this point in the later specific design.王尚书追问：那你是认罪了，自承就是背后主谋？白凡摇头道：下官只是对找到假玉米的巧合无话可说。5. Open two WeChat applications and log in to two WeChat accounts respectively, and you can use two micro signals on your mobile phone.只要张无忌做出选择，以后的事就由不着张无忌了。You can prepare several to deal with special situations, but don't be greedy for knives just because you are afraid of wasting drugs... Use them with caution.张三丰早已达到了传说中的天人合一、阴阳互济的境界，一身功力深不可测，直追达摩等先贤。　　这是一部讲述如天秤般摇摆的一位少女命运的故事。