blackboard Stock Image
by amnarj2006
Description
blackboard
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Keywords
- blackboard
- statics
- mathematical
- acoustics
- electrodynamics
- calculus
- sign
- classroom
- thermodynamics
- symbol
- natural philosophy
- waves
- oscillations
- drawing
- theorems
- handwriting
- electrical
- complexity
- optics
- science
- mechanics
- sketch
- motion
- school
- dynamics
- education