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To obtain the qualification of a preschool teacher, one must have a major in preschool normal education from a secondary specialized school or a secondary vocational school or above. Non-kindergarten teachers' major graduates need a college degree or above to enter for the examination.Women: 500 meters, 1000 meters, 1500 meters, 3000 meters, 5000 meters;"Teacher, when I synthesize crystals, I need to find different conditions to synthesize them, but there are too many tests. Do you have any better methods?" "What do you synthesize crystals for?" "Of course, it is to test its performance." "Then why do we stick to the need to synthesize crystals before testing properties? We can test properties with the results of each time. Maybe we can find better substances, can't we?" "Ah! Yes, thank you, teacher, I'll try it!" In an exchange with Mr. Sun Yimin, the teacher proved once again the correctness of the sentence "Don't stick to books and documents" while solving the problems of the team members.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.The algorithm of (8060 +1000) X130% is wrong.[Collection Appreciation]Instantiate the corresponding object instance based on the class name using the reflected API