已知f(x)的导数在x=a处连续,若lim(x→a)f(x)/(x-a)=-1,则下列结论成立的是()
已知f(x)在[a,b]上可导,则f^' (x)<0是f(x)在[a,b]上单减的( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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