![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[单选题]
竖直角的计算中,盘左仰角观测时,竖直角盘读数为L,则αL=()。
A.L
B.–L
C.L-90°
D.90°-L
查看答案
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.L
B.–L
C.L-90°
D.90°-L
A . 2º15′40″
B . 2º45′10″
C . 2º45′20″
D . 2º45′00″
A.13°26′00″
B.-13°26′00″
C.13°25′00″
D.-13°25′00″
A.L+X
B.L-X
C.180°-(L-X)
D.180°+(L-X)