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免費 化學特性 視頻 - 頁面 4

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colored chemicals pouring into beakers
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scientist looking into a microscope
chemistry equations on a whiteboard
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close up view of male hands pouring water into glass
man and woman doing control at brewery
將樣本注入試管中
two men in a factory
man and woman doing control at brewery
在背景上拍摄绿色三叶草形状的近距离工作室拍摄,以庆祝圣帕特里克日
dropper bottle with clear liquid and aloe vera
chemical formulas and molecular structures animation over scientific data charts
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redheaded doctor in front of camera on gray background.
medical ampoules on conveyor line
demonstrating chemical reactions with sucrose and solutions
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兩個聰明的小朋友在做工程學的學校項目
研究人员的近距离视图 男人手拿着试管在绿色田野中进行害虫控制
orange liquid pouring into beaker on chemists table
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animation of chemical formulas over measuring cups
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beakers being filled with liquid
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animation of scientific data processing over laboratory beakers with liquid
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animation of data processing and chemical formula over beakers
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animation of black structural formulae of chemical compounds on paper
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animation of scientific data processing over test tubes in laboratory
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laboratory beakers with data and structural formula of chemical compounds in the foreground
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animation of dna helix and mathematical formulas over liquid filled beakers in background
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化学化合物 绿色液体
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molecular structures and chemical formulas, scientific research animation over dark background
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little boy and girl with face mask using a microscope. kids and science.
people doing control at brewery
靠近清晰的液體滴入化學試管,標記有測量
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玻璃實驗室用品坐在櫃台上
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animation of mathematical equations over vaccine and vials
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animation of screen with glitch over reagent pouring into chemical glass
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animation of scientific data processing over black background
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兩個聰明的小朋友在練習電氣工程的興趣
red liquid on bottle and molecule models
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animation of dna strand and chemical formula over caucasian male scientist doing experiment
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戴着面具的小女孩们正在建造机器人
empty glass flasks in laboratory. closeup. laboratory glassware
tilt down to a close up shot of conical flasks, which has yellow solution in them
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digital composite video of chemical structures and formulas against various equipment in laboratory
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animation of moving grey dots over liquid pouring into lab glass
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animation of dna strand and data processing over beakers with liquid
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chemical reaction with starch, iodine, and vitamin c
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close-up of a wet daisy flower with water droplets
animation of molecules spinning over laboratory beakers
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little boy with laboratory glassware and a microscope. kids and science.
快速沸騰水的表面在 erlenmeyer <unk>中
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两名儿童正在进行电气施工的近距离拍摄
demonstrating ph changes with butterfly pea flower
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