目的记录几种黄斑病变的局部视网膜电图（localelectroretinogram，LERG），确定其在黄斑病变诊断中的应用价值。
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本地交换路径指南(Local Exchange Routing Guide)
Local Exchange Routing Guide (LERG) US Xchange and CenturyTel agree to load each other's NPA/NXX codes, which may change from time to time in the LERG, int...
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