A.L0=6°n+3° B.L0=3°n-3° C.L0=3°n-1.5° D.L0=3°n
A.1:500 B.1:2000 C.1:2萬 D.1:5000
A.高程系統(tǒng) B.坐標(biāo)系統(tǒng) C.遙感 D.大地坐標(biāo)系統(tǒng)