设函数<img src="/lqwvjeImg/01/010c75e5c3d7ace3175e8b6f9c9caa2a.png">在<img src="/lqwvjeImg/29/29a579d4f441087ac0626915a3bb8317.png">内解析,那么<img src="/lqwvjeImg/69/694a0f52db7a4b67b9869ecb1662004c.png">是<img src="/lqwvjeImg/01/010c75e5c3d7ace3175e8b6f9c9caa2a.png">的极点的充要条件是 ( )<br>·<img src="/lqwvjeImg/28/28748d998b633976d7a0f1670b41ebaf.png">(<img src="/lqwvjeImg/d6/d695a046c66fe0c4af2f85c2ddfc1018.png">为复常数)<br>·<img src="/lqwvjeImg/24/24b426963ac60bdaab9a22a4d4dff8cf.png"><br>·<img src="/lqwvjeImg/ad/ade49bd7f05b460d185fbfe32e5c4cc9.png">不存在<br>·以上都对