close-up of a conical flask, or erlenmeyer flask, containing a bright red liquid in a science laboratory - 錐形燒瓶 個照片及圖片檔
close-up of an unrecognizable chemist analyzing a solution by atomic absorption spectroscopy - 錐形燒瓶 個照片及圖片檔
test tubes and conical flasks, science beakers for research on a classroom desk with blackboard of chemistry teaching. - 錐形燒瓶 個照片及圖片檔實驗室