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Semiconductors
Any solid material with electrical conductivity due to electron flow (as opposed to ionic conductivity) of a magnitude between that of a conductor and that of an insulator.
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香材料產業
Personal care products; Perfume
香材料產業是化工行業的一個分支。這個行業包括天然和合成香料和香水油的生產者。香材料行業是香水、 化妝品和其他產品的這種性質的製造商的一個供應商。 ...