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【单选题】
测站点O和观测目标A、B的位置不变,如以其高度发生变化,则观测结果( )
A.
竖直角改变，水平角不变
B.
水平角改变，竖直角不变
C.
水平角和竖直角都改变
D.
水平角和竖直角都不变
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