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【单选题】
以下关于水准仪安平正确的是( )A.
在较光滑平整的地面上安置三脚架时，架腿应尽量分开
B.
仪器粗平时，转动两个脚螺旋使气泡大致居中
C.
仪器精平时，用手前后左右移动三脚架的一条架腿
D.
取出水准仪时，观察仪器在盒中的位置，以便用放回
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