______ Saturday morning,I cleaned my room.______ the afternoon I did some reading A.On;on B.In;in C.On;in D.In;on 答案:C甲烷燃料电池是一种新型化学电源,该电池是以铂丝为电极,KOH为电解质溶液,然后从两极分别通入甲烷和氧气,该电池的电极反应为:X极 CH4-8e-+10OH-=CO32-+7H2OY极 2O2+8e-+4H2O=8OH-关于此燃料电池的下列说法不正确的是( )A.通入CH4的X极为电池的负极,通入O2的Y极为电池的正极B.电池工作过程中溶液pH将下降C.放电时每转移4mol电子,正极有1mol O2被氧化D.该燃料电池的总化学方程式可表示为:CH4+2O2+2KOH=K2CO3+3H2O