9. The height of instrument is equal to
A. reduced level of bench mark + intermediate sight
B. reduced level of bench mark + back sight
C. back sight + fore sight
D. reduced level of bench mark + fore sight
9. The height of instrument is equal to
A. reduced level of bench mark + intermediate sight
B. reduced level of bench mark + back sight
C. back sight + fore sight
D. reduced level of bench mark + fore sight