铸铁焊条中的镍基焊条主要有（）。
A、纯镍铸铁焊条ABD
暂无解析
英译汉：Theimplicationsforbusinessesarevital,sincethisemergingtechnologymaychangehowcompaniesselltheirgoods.Ramificationscompaniesneedtotakestepstoaddressinclude:·Disintermediationofindividualauctionenvironmentsthroughbotsthatallowbuyerstoautomaticallypollmultipleauctionservicesandfixed-pricechannelstogarneradvantageousterms;
名词解释：E-R图
翻译：saletax
闯入;侵扰v.i_______________
简述商品类电子商务网站应提供的服务内容。
