【单选题】【消耗次数：1】
应用水准仪时，使圆水准器和水准管气泡居中，作用是分别判断 ( )。
①
视线严格水平和竖轴铅直
②
精确水平和粗略水平
③
竖轴铅直和视线严格水平
④
粗略水平和视线水平
参考答案：
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相关题目
【单选题】
水准仪圆水准器轴平行于仪器竖轴的检验方法是：安置好仪器后，先调节圆水准气泡居中，然后将仪器绕竖轴旋转（ ）度，来观察气泡是否居中，以说明条件是否满足。
①
60
②
120
③
90
④
180
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