题目内容
(请给出正确答案)
[单选题]
已知直线AB磁方位角为58°40′52″磁偏角为西偏2′20″,则该直线的真方位角为()。
A. 58°40′52″
B. 58°42′52″
C. 58°43′12″
D. 58°38′32″
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A. 58°40′52″
B. 58°42′52″
C. 58°43′12″
D. 58°38′32″
A.114.90,-38.23
B.-114.90,38.23
C.115.07,-35.90
D.-115.07,35.90
A. 114.90,-38.23
B. -114.90,38.23
C. 115.07,-35.90
D. -115.07,35.90
A.+145.859
B.-145.859
C.+136.840
D.-136.840
A.319°00′
B.139°46′
C.319°46′
D.139°00′
A.22%
B.2.2%
C.-22%
D.-2.2%
B.用鉴定钢尺量距
C.在A、B两点间安置水准仪
D.在A点桩立尺,读取读数ha
E.在B点桩侧立尺,上下微移,当水准仪水平中丝正对hb(Hb=HA+ha-H)时,叫“好”或“停”,尺不动,沿尺底B桩侧面画一横线,此横线即为所测设之高程H。