塑料袋有偿供应的思考
Think over the Plastic Bags Paid Services
研究结果：中国城市土地市场由于土地有偿供应方式的不同，存在出让年期和租赁年期两种模式。
The results indicate that there exist two patterns as remising and leasing due to the differences of compensated urban land supply in China .
有偿供应