单项选择题
A.500 B.400 C.300 D.200
A.50 B.100 C.200 D.150
A.2000M2,25000M2 B.3000M2,25000M2 C.1500M2,3000M2 D.2000M2,26000M2
A.1000M,21000M,21000M2 B.500M,2500M,2500M2 C.1000M,2500M,2500M2 D.1000M,2500M,21000M2
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