[单选题]

A
f(-x,y)=f(x,y),f(x,-y)=-f(x,y)
B
f(-x,y)=f(x,y),f(x,-y)=f(x,y)
C
f(-x,y)=-f(x,y),f(x,-y)=-f(x,y)
D
f(-x,y)=-f(x,y),f(x,-y)=f(x,y)
正确答案:B
题目解析
要求f(x,y)关于x和y都是偶函数。
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