Chen Yan Books

Da xue yu wen
Da xue yu wen

By Chen Yan

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Guo ji mao yi li lun yu shi wu
Guo ji mao yi li lun yu shi wu

By Chen Yan

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Ben shu you 18 zhang zu cheng,Dui guo ji mao yi li lun yu shi wu zuo le lun shu,Ju ti nei rong bao kuo:guo ji mao yi zheng ce,Guo ji mao yi cuo shi,Gong ping mao yi jiu ji cuo shi,Guo ji mao yi shu...

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Wei sheng jian du ying dui tu fa gong gong wei sheng shi jian shi yong shou ce
Wei sheng jian du ying dui tu fa gong gong wei sheng shi jian shi yong shou ce

By Chen Yan

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Ben shu cong shi yong de jiao du, Xi tong di jie shao le tu fa gong gong wei sheng shi jian de yan jun qu shi, Wei sheng jian du zai ying dui tu fa gong gong wei sheng shi jian zhong de di wei he z...

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Xin ling zhi sheng
Xin ling zhi sheng

By Wei Er Ke Wei Ke, Chen Yan

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Tang niao bing fang zhi 200 wen
Tang niao bing fang zhi 200 wen

By Chen Yan

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Xi jing gu shi
Xi jing gu shi

By Chen Yan

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What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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