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【单选题】
下列生活常识中,错误的是( )。
A.
菜刀的刀刃薄是为了减小受力面积,增大压强
B.
发令枪中的“火药纸”打响后,产生的白烟是五氧化二磷
C.
酸雨是指pH值小于5.6的雨、雪或者其他形式的大气降水
D.
液化石油气的主要成分为甲烷和丁烷
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