单项选择题
A.横轴 B.竖轴 C.旋转轴 D.视准轴
A.1/2000 B.1/3000 C.1/4000 D.1/5000
A.4687 B.2787 C.4686 D.4786
A.水准轴 B.水准管轴 C.横轴 D.圆水准轴
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