单项选择题
A.10-1 B.10-2 C.10-3 D.10-4
A.0.01 B.0.001 C.0.0001 D.0.0005
A.0.5mm B.0.6mm C.0.8mm D.1.0mm
A.DOM B.DEM C.DSM D.DLG
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