Blackboard background chalk hand drawn creative minimalist style dissertation study summary ppt template

Chalk hand-drawn globes, addition, subtraction, multiplication and division symbols, scales, test tubes, apples, envelopes, arrows, school bags, pencils, notepads, light bulbs, books, speech bubbles, small blackboards, desk lamps, pen holders, world maps and other learning tools and classroom tools , Education and teaching elements, blackboard style background, chalk hand-painted, suitable for thesis defense, defense summary, study summary report and other scenes, simple atmosphere blackboard style ppt template.