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定义在R上的函数f(x)是奇函数又是以2为周期的周期函数,则f(1)+f(4)+...
定义在R上的函数f(x)是奇函数又是以2为周期的周期函数,则f(1)+f(4)+f(7)等于( )
A.-1
B.0
C.1
D.4
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