题目内容
(请给出正确答案)
[单选题]
经纬仪的竖盘按顺时针方向注记,当视线水平时,盘左竖盘读数为90°用该仪器观测一高处目标,盘左读数为75°10′24″,则此目标的竖角为()。
A.5710′24″
B.-1449′36″
C.1449′36″
D.75°10′24″
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A.5710′24″
B.-1449′36″
C.1449′36″
D.75°10′24″
A.72,54,06
B.17,05,54
C.-72,54,06
D.-17,05,54
A.57o10′24″
B.-14o49′36″
C.14o49′36″
A.+3′
B.-3′
C.-2′
D.+ 2′
A.-23°25'00''
B.23°26'00''
C.23°25'00''
D.23°26'00''