A . 89º24′22″
B . 89º25′22″
C . 89º25′52″
D . 89º24′52″
A.水准管轴不平行于横轴;
B.仪器竖轴不垂直于横轴;
C.水准管轴不垂直于仪器竖轴;;
D.视准轴不垂直于横轴;
A.L+X
B.L-X
C.180°-(L-X)
D.180°+(L-X)
A.+8°41′18″
B.-8°41′18″
C.+8°18′42″
D.-8°18′42″
A.180º00′09″
B.170º59′51″
C.179º59′57″
D.180º00′03″