solvent-support ratio 溶剂载体比
potential support ratio 潜在赡养率
food self-support ratio 粮食自给比率
actual old support ratio 实际老年抚养比
emergy self-support ratio 和能值自给率
theoretical old support ratio 理论老年抚养比
support extension ratio 支架伸缩比
ratio-weighted support 比例加权支持度
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