设区域D由曲线围成，则
D
按功能可以将神经元分为
Becareful,_______you'llfalldown.
设f(x,y)具有一阶偏导数，且对任意的(x,y)，
设奇函数f(x)在上具有连续导数，则()
Othersarguethatsincetheearthhasenduredalongstringoficeagesinthelasttwomilliontothreemillionyears,anywarmingis________tobetemporary.
围成，则