Oxygen molecule. Computer model of a molecule of oxygen (O2). The two atoms are joined by a double bond. Oxygen is a colourless gas at room temperature. It makes up one fifth of the Earth's atmosphere. Oxygen is extremely reactive, forming oxides of most elements. It has an important role in animal and plant respiration and combustion.

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TOP10164551

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達志影像

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RM

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須由TPG 完整授權

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