单项选择题
A.1m B.1.2m C.1.5m D.2m
A.9m,50-100mm B.9m,75-150mm C.12m,50-100mm D.12m,75-150mm
A.7m B.14m C.100m D.200m
A.80㎡,6.7m B.60㎡,5.8m C.30㎡,4.4m D.20㎡,3.6m
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