g(x,y)=|x-y|f(x,y),f(x,y)在(0,0)点连续且f(0,0)=0,则g(x,y)A.在(0,0)点连续,但偏导不存在B.在(0,0)点可微C.在(0,0)点偏导存在,但不连续D.在(0,0)点偏导存在,但不可微
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