在一般的假设条件下 ，我们应用性能势的基本性质直接建立了无限时间水平平均代价模型的最优性方程 ，并且证明了在紧致集上最优解的存在性 。
Under a general assumption, we establish directly the optimality equation for infinite time horizon average cost model and prove the existence of optimal solution in a compact action set by using p.
收回房产即耗时又代价昂贵，它平均需要18个月的时间而且估计需要大约为贷款额20-25%的成本。
But foreclosure istime-consuming and expensive, taking 18 months on average and costing anestimated 20-25% of the loan balance.
采用索引广播的方式可以使移动设备选择性地侦听信道，通过建立基于数据访问概率的索引树，以降低平均访问代价。
The mobile client may selectively to intercept the channel by the index broadcast, the average cost can be reduced through the establishment base on the data accessing probability of the index tree.
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