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They should do exercises as ________ as possible to keep _________.
已知函数f(x)的定义域为R,直线x=1和x=2都是曲线y=f(x)的对称轴,且f(0)=1,则f(4)+f(10)=____
新中国成立后,农村生产关系经历了四次调整。依据下列图片农村生产关系调整的先后顺序正确的是( )