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For interface programming, a lot of changes that may occur in the system in the future can be isolated. Why? If the code is written for an interface, he can implement the interface with any new class through polymorphism. However, when the code uses a large number of specific classes, once new specific classes are added, the code must be changed. Violating the opening and closing principle.本片从两个不同角度讲述了一对夫妻的故事，他们从56K调制解调器的时代开始约会，并在接下来的二十年中维护着这段感情。《解密档案》是由俞钟导演，丁海峰、徐筠等主演的28集电视连续剧。从题材上看，这是一部谍战剧，但在剧情上，它又是一部情感戏，导演俞钟评价这是一部男性观众和女性观众都适合观看的电视剧。I thought this thing was the same as before, Is to rush up and bite people, So we're just shooting with guns, When the distance is close, throw it with a grenade. At the most dangerous time, even mines are thrown out, At that time, the 'round head' anti-infantry mine (still referring to Type 72 anti-infantry mine) had a 'bolt' (i.e. Safety ring) under it. Just pull it out, Throw it out like a grenade, But more powerful than a grenade, As soon as a large area is blown up, But because it is heavier, More than three grenades, Therefore, those with weak throwing ability generally dare not use it like this. Because I'm afraid I can't throw it out of the safe range and blow it up to myself, But fortunately, whatever it is, As long as you want to attack, It must be an attack on the ground, We have a great advantage from a high position. Throwing explosives from high to low can increase the throwing distance, Even if you can't throw it far away, After landing, you can also roll down a little further distance. Therefore, some comrades who throw grenades not far away can also throw mines away from a safe distance to strike the enemy. Then there is the explosive cartridge, The vast majority of people can't throw out three pieces of explosive cartridges in one go like a company commander. And it is too wasteful to throw them all like that, So he threw the explosive cartridges out one by one, When the "big grenade" is used, The reason why I dare to do this and make such "rich" moves is because there are not many others in our positions, that is, grenades, mines and explosive cartridges are plenty of explosives, and many to "tube enough", thanks to these, otherwise in the period of time without artillery support, the Vietnamese army's offensive forces increased several times, and the guns in hand alone could not hold up completely.Why do female reporters of the NPC and CPPCC like to wear red clothes so much? It is said that besides conforming to the atmosphere of the NPC and CPPCC, this actually has other historical origins. That is Wu Xiaoli.【空军】是庆祝电视台启播25周年，在新加坡空军部队的协助下拍摄的，由6个独立单元组成，内容反映空军人员的训练、工作与家庭生活。 除了气宇轩昂的男艺人李南星、陈天文、陈之财、郑国平、王玉青、洪国锐等纷纷以帅气十足的空军服亮相外，展示了新加坡空军部队的各种先进配备及气势磅礴的军事场面。 一系列7集的单元故事包括： “夺标”－描述空军飞行员训练学校的龙争虎斗； “驾着天马的战士”－在天气恶劣的澳洲上空参加军事演习的空军机师，如何临危不乱，凭日月星辰辨认方向，把军队安然送到目的地； “误航”－在美丽女间谍色诱下，空军如何进行反间谍措施化险为夷……　　但何晓慧的幸福很快就被打碎，何晓慧竟然发现了丈夫赵子健出轨的照片！何晓慧难以接受这个事实，二人只好协议离婚。但何晓慧不知道，在赵子健离婚的背后，是另外一双伸向自己的罪恶黑手……