已知某连续时间<img src="https://static.zxtiku.com/wangke/imgs/topic/77e77c6e5437c01278138c4989e4db28.png"/>系统的单位冲激响应<img src="https://static.zxtiku.com/wangke/imgs/topic/ef3fead9e984e88c54a0e706c0abd63b.png"/>，系统的频率响应<img src="https://static.pphuashu.com/wangke/imgs/topic/67375a8d8ef48765308a2f5e09542dbc.png.png"/>( )