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The Constitution is the fundamental law of our country and has the highest legal effect. On December 4th, China’s Constitution Day, we must carry forward the spirit of the Constitution and promote innovation.
This is a picture of the city building and aircraft for the PowerPoi...
This is a classic mathematic symbol for the background picture of th...
This is a simple style orange background art design PowerPoint templ...
This is a PPT template with a light gray for the background color of...
This is a beautiful and beautiful urban architectural background of ...
This is a black background for the PPT background, the line with the...