选择题:水准测量中,调节圆水准气泡居中的目的是使()A:竖轴竖直B:视准轴水平C:十字丝横丝水平D:十字丝竖

题目内容:
水准测量中,调节圆水准气泡居中的目的是使()
A:竖轴竖直
B:视准轴水平
C:十字丝横丝水平
D:十字丝竖丝竖直
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