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(7) Having engaged in at least 20 maintenance and testing activities of fire fighting facilities for industrial buildings and civil buildings with a single building area of more than 20,000 square meters equipped with automatic fire fighting facilities in the three years prior to the date of application;接下来四抬是葵花子、南瓜子、松子和西瓜子，这是子孙满堂。From the above command class code, we can see that any operation has an execute method to perform the operation. The above code uses traditional object-oriented programming to implement the command mode. The procedural request call of the command mode is encapsulated in the execute method of the command object. Have we found the above writing code a little cumbersome? We can do this using the callback functions in javascript, In object-oriented, The receiver of the command mode is saved as an attribute of the command object, and the command execution operation is agreed to call the command.execute method. However, if we use the callback function, then the receiver is closed in the environment where the callback function is generated, and the execution operation will be simpler. Only the callback function can be executed. Let's look at the following code:榊真喜男（长濑智也饰）是关东黑社会锐牙会所老大的儿子，肩负着继承会所的重大使命，可是由于他“考虑事物的能力只有前90秒”，稍谈不拢就以暴力解决，好几笔生意都被他搅黄，给组织造成重大损失。Public class Plus implementations Expression {Flight Simulator Keyboard Control