单项选择题
A.25mm以上B.0.5m以上C.1.5m以上D.2m以上
A.0.5m~1.5m,30mmB.0.5m~1.5m,50mmC.25mm~0.5m,30mmD.25mm~0.5m,50mm
A.1.2mB.1mC.900mmD.500mm