单项选择题
A.20m×20m B.18m×18m C.15m×15m D.12m×12m
A.6m,5m B.6m,4m C.5m,5m D.5m,4m
A.7m B.6m C.5m D.4m
A.50m B.30m C.24m D.13m
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