单项选择题
A.12mX12m B.13mX13m C.15mX15m D.18mX18m
A.3.5m;2% B.3.5m;3% C.4.0m;2% D.4.0m;3%
A.1.5h;1.5h B.1.5h;2.0h C.2.0h;1.5h D.2.0h;2.0h