Thomas Knoll’s Algorithm
（二）业务之间具有明显的主附关系。主要业务居于主体地位，体现交易的实质和目的；附属业务是主要业务的必要补充，并以主要业务的发生为前提。，推荐阅读爱思助手下载最新版本获取更多信息
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This includes expertise vital to keeping the oil pumps working: with the skilled engineers formerly on the PDVSA payroll now plying their trade elsewhere, the system limps on with a skeleton staff.
it starts and ends its lifecycle through automation?，更多细节参见heLLoword翻译官方下载
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