单项选择题
A.0.9m B.1m C.1.2m D.1.5m
A.5倍 B.4倍 C.3倍 D.2倍
A.2.6mm B.2.8mm C.3.0mm D.3.2mm
A.48×3.5 B.48.3×3.6 C.50×3.0 D.51×3.0
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