单项选择题
A.5 B.10 C.12 D.15
A.6000㎡ B.3000㎡ C.4800㎡ D.8000㎡
A.0.5h B.0.75h C.1.0h D.1.25h
A.0.25h B.0.5h C.0.75h D.1.0h
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