My hands are dirty, but your hands are . [ ]
A. clean
B. wet
C. tired
答案:A
已知等腰三角形的两条边长分别为4和8,则它的周长为 ( )
A.16
B.20
C.16或20
D.12
已知函数f(x)=x3-3x2+10.
(1)求f'(1);
(2)求函数f(x)的单调区间.