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This is a PPT background picture of a wooden border blackboard;
Keywords: blackboard eraser, blackboard PowerPoint background picture, PPT courseware background picture
The micro-body style family education publicity lecture presentation...
Business Work Responsibility and Execution Training PPT templates ar...
The PPT animation effect opens with a black background, showing the ...
The PPT template of the Jianjun Festival adopts the elements of Chin...
Happy Birthday Blessing PPT template is a set of PPT templates with ...
The business plan planning book PPT template, using European and Ame...