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1, Putonghua level should meet the "Putonghua Proficiency Test Grade Standard" issued by State Language Commission Grade II, Grade B and above standards.The best way to conform to the opening and closing principle is to provide an inherent interface, and then let all classes that may change implement the interface, allowing fixed interfaces to interact with related objects.Http://ncdz.gamebbs.qq.com/forum... read&tid=156362Slow POST attack uses POST request method. The attacker sends POST request message to the target server to submit data. The length of the data is set to a large value. However, in the subsequent data transmission, only a small message is sent each time, which causes the target server to wait for the attacker to send data. If an attacker controls a large number of zombie hosts to launch such attacks on the target server, the server will run out of resources and cannot provide services normally.此片由真实故事改编。讲诉一个毒贩被警察抓获，帮警察做任务来减少刑期。因为他的地域优势和才能，反犯罪集团决定任命他为卧底潜入一个威名远扬的摩托帮派——瓦格斯帮（Vagos）。在他潜入的过程中，必须经过一次又一次的伪装和打交道，才能在帮里调查出他们的底细。但在做任务的过程中，同时也在面临着危险....