下列何種經緯儀儀器誤差不能藉由正倒鏡觀測取其平均值而消除之？(A)當望遠鏡水平時，縱角讀數不是0度或90度(B)橫軸與垂直軸不正交(C)視準軸、橫軸及垂直軸未能交於一點(D)水準管軸與垂直軸不

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40. 下列何種經緯儀儀器誤差不能藉由正倒鏡觀測取其平均值而消除之？
(A)當望遠鏡水平時，縱角讀數不是0度或90度
(B)橫軸與垂直軸不正交
(C)視準軸、橫軸及垂直軸未能交於一點
(D)水準管軸與垂直軸不垂直

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