<img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/8f/53/8f5362b189e7b8a9cd67270e3fad3c7d.jpg" style="width: 100%;height: auto;">示。杆AB的运动形式为： <img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/2c/13/2c1316e31ae0a1caf582dc7a65fbd6a2.jpg" style="width: 100%;height: auto;"><img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/d0/dd/d0dd3ed2225ca01ea04da01c08177477.jpg" style="width: 100%;height: auto;">