Previously they are often made of copper that is precious in price and poor in nature resources, so it is certain that they will be made of brazed steel tube instead of copper tubes.
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以往采用铜来生产这种油管,其成本较高、资源少且加工精度低,而用卷焊管替代铜管则是发展的必然趋势。
单词 Previously they are often made of copper that is precious in price and poor in nature resources, so it is certain that they will be made of brazed steel tube instead of copper tubes. 的词典定义。@海词词典-最好的学习型词典
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