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Reporter Station: Please give a brief introduction to this special award?Article 17 Operations of Direct Vessels? There have been three industrial revolutions in human history. The industrial revolution has greatly promoted the development of productive forces, brought earth-shaking changes to people's lives, and also changed the original layout of the world's industry. The countries leading the industrial revolution have become the dominant powers in the world. The first industrial revolution made Britain's empire never set. The east wind of the second industrial revolution made the United States and Germany dominate the world. The third industrial revolution maintained the global hegemony of the United States.The Crusaders also had a relatively simple fight. There was a mailbox near the horse mission with a mission on it. After receiving the mission, it was completed immediately and was purely an experience-giving mission. An abandoned letter? Set the methods in the above multiple factory method modes to static, and call them directly without creating instances.12. Os.system ()--Execute shell commands. Example: