單項選擇題點(diǎn)x=0是函數(shù)y=x4的().

A.駐點(diǎn)但非極值點(diǎn)
B.拐點(diǎn)
C.駐點(diǎn)且是拐點(diǎn)
D.駐點(diǎn)且是極值點(diǎn)


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