A.概略研究 B.預(yù)可行性研究 C.可行性研究 D.一般研究 E.專項(xiàng)研究
A.1:50000 B.1:250000 C.1:5000 D.1:10000 E.1:50000
A.1:50000 B.1:250000 C.1:5000 D.1:10000 E.1:20000