C2B electronic commerce is also known as e-tailing.

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• Dipole allowed optical transition occurs between two electronic state with same symmetry
• E-commerce or electronic commerce refers to commercial t（） conducted online.（a piece of business, for example, an act of buying
• The first electronic computer in 1945 was so bulky that it filled a large room and weighed 30 tons.
• 能将X线直接转换成电子信号的材料是（）can convert X-ray into electronic signal directly
• Usually, there are two waysto submit your resume online: by direct （） to a hiring firm or by filling an electronic form and ente