单项选择题
A.60m3 B.70m3 C.80m3 D.90m3
A.25~40m;1.5m B.15~25m;1.2 m C.15~25m;1.5m D.25~40m;1.2m
A.2倍 B.3倍 C.4倍 D.5倍
A.80mm B.90mm C.100mm D.70mm
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