...答这一效果，这些假说有：压力集团和利益集团模型(The Pressure Group Interest Grouo Model)、加法机模型(Adding Machine Model)、社会状况模型(The Status Quo Model)、社会变迁模型(the Social Change Model)、比拟本钱假说(comparative Costs Model)及对外...
The utilitymodelrelates to aportableoilingmachineusedforadistributiontransformer, which belongs to a portableoilingdevice for adding oil to distribution transformers.