设<img src="https://zk.995w.com/lqwvjeImg/67/67bdfb637038d8ee95e4507ed46a45fd.png" style="font-size: 20px;" >,则<img src="https://zk.995w.com/lqwvjeImg/6d/6d06468ed86af261e2c1d35b8fa22cf0.png" style="font-size: 0.85rem; width: 68px; height: 21px;" >所表示的曲线为( )<br>·<img src="https://zk.995w.com/lqwvjeImg/fd/fd8470dfa8be0d619b0112b3dfdebbbd.png" 的直线<br>·<img src="https://zk.995w.com/lqwvjeImg/80/803ed3fced9d46e21f194112c18ee620.png" 的直线<br>·<img src="https://zk.995w.com/lqwvjeImg/6c/6c26ba9606290aaa47ec60a05ca068d4.png" 的直线<br>·<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/uploadFile/photo/1698996012729_2b7781e7c2ad4672b9c257294e36fa13.png" 的直线