若某系统的传递函数为G(s)=<img src="https://zk.995w.com/lqwvjeImg/70/706290e47431d6731472df31e80ea77e.png" style="width:41px;height:39px;">,则其频率特性的实部R(ω)是( )<br>·<img src="https://zk.995w.com/lqwvjeImg/8c/8cd7e7152465459eb32d65cfd4ad34b9.png" <br>·-<img src="https://zk.995w.com/lqwvjeImg/8c/8cd7e7152465459eb32d65cfd4ad34b9.png" <br>·<img src="https://zk.995w.com/lqwvjeImg/a8/a843be7f24826775bf4bf3ca2ce04d1e.png" <br>·-<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/17005463422604c074c843c794805b8261e8a0b2a0e21image3.png"