由带切口的圆柱的二视图确定正等测图。<img src="https://file.icve.com.cn/ssykt/518/108/8191B00410D8B7A41F5A1D13805BFD8B.png"/>
①
<img src="https://file.icve.com.cn/ssykt/88/30/16007829136625401BF909B0247A3118.png">
②
<img src="https://file.icve.com.cn/ssykt/166/30/29807A54E3FACAB4D86DDD27B89EC33B.png">
③
<img src="https://file.icve.com.cn/ssykt/710/356/B185913A852ECE94C161B4D1BA5B63B1.png">
④
<img src="https://file.icve.com.cn/ssykt/302/962/4B9F0BA14AF9FE68BFD6242418697040.png">