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A distinct substance made of two or more elements according to a proportion determined by weight. Its composition is expressed by means of a chemical formula, which lists the various elements present as well as the relative number of each element. Acids are chemical compounds determined by how they react with another type of complementary chemical compound, the bases.求助。
加拿大电商昨天我把提单复件发给了客户，今天收到了他回信，如下： Dear Nicholas, please send all shipping documents. We will check B/L copy and we will reply ASAP. Thank you Best Regards ......................................... 加拿大电商刚从事这行半年，对电子行业不了解，自己整理了些，算是学习，供大家分享，也请大家补充。我毕竟是个文科生，对这方面知识严重欠缺。 DVD:英文全名是Digital Video Disk, 即数字视频光
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