简约线条手绘风科学实验教育主题实验室元素插画

scientific theme illustration set, minimalistic style, black and white color scheme, beakers, measuring cylinders, DNA double helix, magnifying glass, hourglass, test tubes, microscope, molecular structure, atomic model, globe, books, triangle ruler, compass, alcohol lamp, graduation cap, chemical equations, handprints, evenly distributed objects, decorative elements of scientific instruments and symbols, pure black background, white line details, professional and educational style