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Explain the template method mode, which means: in an abstract class, there is a main method, and then define 1... n methods, which can be abstract or actual methods, define a class, inherit the abstract class, override the abstract method, and realize the call to subclasses by calling the abstract class. First look at a diagram:For friends who often need to write English, it is quite troublesome to change the case and lowercase of letters. We can obtain quick conversion requirements through the "Start"-"Change Case" function in Word documents.Example 1? Only one "visibility parameter" is used in this example, instead of "action". In this example, "parameter" is added first, then "action" is added, and "action" is bound to "parameter". Of all the "parameters" of dynamic blocks, only "visibility", "alignment" and "base point" do not need to bind "actions", and the others need to bind "actions".2. If radar equipment is equipped and usable, it shall be used correctly, including long-distance scanning, in order to obtain early warning of collision risks, and radar plotting or equivalent systematic observation of detected objects.在原本的历史上，项羽失去了北方土地，因为无颜见江东父老，而自刎乌江之畔。4. Click to download: in duplicate (positive and negative printing), the unit certificate shall be stamped with the official seal and the legal person certificate shall be signed.