【单选题】【消耗次数：1】
旋转光学经纬仪的望远镜时，竖盘？。
①
随望远镜旋转，竖盘读数指标不动
②
不动，竖盘读数指标随望远镜旋转
③
不动，竖盘读数指标也不动
④
与竖盘读数指标都随望远镜旋转
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