题干
已知函数f（x）=log
（
）满足f（﹣2）=1，其中a为实常数．
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They usually 
CO2(g)＋H2(g)达平衡后，得到0.6 mol CO2；再通入0.3 mol水蒸气，达到新平衡状态后，CO2的物质的量可能是( )