單項(xiàng)選擇題
A.一年 B.二年 C.三年
A.2m B.4m C.6m
A.3m B.4m C.5m
A.30mmB.50mmC.25mm
A.20m B.24m C.30m
A.1m B.0.5m C.1.5m
A.1倍B.1.5倍C.2倍
A.1000mm B.1500mm C.2000mm
A.250mm B.500mm C.800mm
A.20mm B.50mm C.100mm
A.1m B.1.5m C.1.8m