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There is a 3.4-second bully, and some high-end routines will be discussed later.Vertical speed (ft/min)正要说话，就听外边一个声音喊：秋霜，秋霜。Teaching Physics with the Principle of Deliberate Practice//3002.5. 4.2The policy mode is the packaging of the algorithm, which separates the responsibility of using the algorithm from the algorithm itself and delegates it to different objects. Policy patterns usually wrap a series of algorithms into a series of policy classes. To encapsulate the policy pattern in one sentence is to "encapsulate each algorithm into a different policy class so that they can be interchanged". The following is the structure diagram of the policy mode:Component: Obviously, the four components are set, and the components specified by it will be directly used. With this attribute, communication between different application components can be realized.