Od SergeyNivens 3900x2340 px
ID fotografie z fotobanky: 52873743
Close up of business person hand measuring
Close up of business person hand measuring bulb
Hand drawing formulas on desk
Man's hand writing some calculations on a blackboard
Rear view of businessman drawing with marker business sketches on wall
Young confident woman wearing glasses standing near blackboard
Image of thoughtful male student holding notebook in classroom
Young funny man in glasses against chalk blackboard
Business person standing against the blackboard with a lot of data written on it
Young man scientist looking in magnifying glass
