进行角度测量时，若目标是标杆，要求尽量瞄准标杆的底部，其主要原因是（）。

答案查看网，轻松搜题/搜资源

【单选题】【消耗次数：1】

① 减弱目标不竖直的影响

② 减弱水平面代替水准面的影响

③ 减弱大气折光的影响

④ 减弱环境温度的影响

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