题目

The film today is not interesting the one yesterday. A . /; than B . as, than C . so, as D . as, so 答案：C下列物质的化学式正确的是A. 氧化镁MgO                B. 碳酸钠NaCO3   C. 氧化铁O3Fe2                D. 氢氧化钾K（OH）2