【单选题】【消耗次数：1】
三角高程测量要求对向观测垂直角，计算往返高差，主要目的是( )。
①
有效地抵偿或消除球差和气差的影响
②
有效地抵偿或消除仪器高和觇标高测量误差的影响
③
有效地抵偿或消除垂直角读数误差的影响
④
有效地抵偿或消除读盘分划误差的影响
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