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管水准器用来指示视准轴是否水平；圆水准器用来指示（）是否竖直。

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管水准器用来指示视准轴是否水平；圆水准器用来指示（）是否竖直。

A.竖丝

B.中丝

C.视距丝

D.竖轴

参考答案:

答案：竖轴

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