abstract
back
blackboard
board
border
capacitor
chalk
chalkboard
circuit
circuitry
class
component
contour
device
diagram
digital
diode
draft
drawing
education
electric
electrical
electricity
electronic
engineering
frame
industry
modern
physics
plan
project
research
resistor
schematic
scheme
school
science
scientific
sign
teacher
tech
technical
technological
technology
template
transistor
university
wire
定額
electronic circuit scheme on chalk board backgroundの素材 [FY31044120694]
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