一线性时不变连续时间系统，在某激励信号作用下的自由响应为<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/204a6d4c2d874dd08526bb2263cb7e9c.png?x-oss-process=image/sharpen,200"/>，强迫响应为<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/9320f4bb19ac4f6180446b822a611410.png?x-oss-process=image/sharpen,200"/>,则下面说法正确的是：