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【简答题】
把椭圆C的短轴和焦点连线段中较长者、较短者分别作为椭圆C′的长轴、短轴，使椭圆C变换成椭圆C′，称之为椭圆的一次“压缩”．按上述定义把椭圆C i （i=0，1，2，…）“压缩”成椭圆C i+1 ，得到一系列椭圆C 1 ，C 2 ，C 3 ，…，当短轴长与截距相等时终止“压缩”．经研究发现，某个椭圆C 0 经过n（n≥3）次“压缩”后能终止，则椭圆C n-2 的离心率可能是：① 3 2 ，② 10 5 ，③ 3 3 ，④ 6 3 中的______（填写所有正确结论的序号）
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