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Since the single mode is instantiated only once, the first call returns an instance object of a. When we continue to call, the instance of b is the instance of a, so aa is printed below.I nodded at this passage, Understand that what Zhang Xiaobo said is indeed reasonable, It is not a lie, Here I think it is necessary to give you one thing about popular science. So we have to say something digressive: The result of a real bullet hitting a petrol tank is not the same as that shown in most movies. One shot can explode the petrol tank, But this is not the case, Although a pure metal projectile will rub against the air at a speed of hundreds of meters per second to generate equivalent heat, And will produce sparks after hitting the metal oil drum, But none of this is enough to ignite petrol, Especially for gasoline with a large total amount, to ignite gasoline, please remember one thing-open flame must be used. In addition, gasoline is a flammable item, but it is not an explosive item in the true sense. Only after reaching a certain total amount can explosion be caused. If the total amount is insufficient, it can only cause combustion without explosion.看着陆冰消失的背影，沈炎撇撇嘴：用得着等下一周，下午我就去参观母校。The next day, Mary went to Beijing No.6 Hospital and did many examinations. Mary acted like a "fool" that day and was extremely slow. The doctor asked her about her illness. She had to hold back for a long time before she could answer. She was diagnosed with severe depression and "must be cared for". The doctor also asked her if she would like to be hospitalized, but Mary refused.The name of MDT can not only give doctors a clear understanding of the disease categories discussed in this MDT, but also give patients guidelines for seeking medical treatment.The meaning of cache agent is to cache the first run time, and when running the same again, it will be taken directly from the cache. The advantage of this is to avoid repeating the operation function once. If the operation is very complicated and consumes the performance, then using cache objects can improve the performance. We can first understand a simple cache column, which is the common addition and multiplication operations on the Internet. The code is as follows:When a process or series of steps consistent at a certain level of detail is to be completed,