问题
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13, 9, 11, 6, 9, 3,______,______ () A.6,0 B.-1,1 C.7,0 D.7,6
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2/5, 3/7, 4/10, 6/14, 8/20, 12/28,______ () A.224/56 B.14/32 C.20/48 D.16/40
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1,10,2,______,3,8,4,7,5,6 A.6 B.7 C.8 D.9
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3,8,6,11,9,14,______,______ A.11,16 B.12,16 C.12,17 D.13,17
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6,4,12,8,18,16,__________。 A.24.18B.20.32C.24.32D.18.64
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高层民用建筑之间的防火间距不应小于________米。A.6 B.7 C.8 D.13