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【单选题】
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.
十字丝竖丝竖直
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A.
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B.
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C.
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D.
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A.
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B.
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C.
will be ended
D.
will end
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