【单选题】【消耗次数：1】
图示汽车路过十字路口，在转弯时，由A到B这一段路程中，若已知车体尾部C、D两角的速度大小分别为vC和vD，C、D之间的距离为d，则汽车绕定轴O转动的角速度大小为<img src=https://huaweicloudobs.ahjxjy.cn/A66628A7904F64258CA95175DB6CCD11.png title=QQ截图20190715141952.png alt=QQ截图20190715141952.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/6C87E99C0B31A396BA554CDCFB1E2E88.png title=4.png style=white-space: normal;/>
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