若<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/c94136d6be1a4a59a8c00840f70265df.png?x-oss-process=image/sharpen,200"/> 收敛于<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/6e98b494f4a949d49d29da876a74b6ca.png?x-oss-process=image/sharpen,200"/> ，<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/a89a39852efd4bc1a51a4191bad3ef48.png?x-oss-process=image/sharpen,200"/> 为部分和，则下列结论中一定正确的是