若函数f(x)=x3﹣6bx+3b在(0,1)内有极小值,则实数b的取值范围是( ).
My grandmother is too ___________, she can't lift up the heavy box. [ ]
A. old
B. young
C. strong
D. heavy
凸轮机构中做等速连续转动的构件是()
A.凸轮
B.机架
C.从动件
D.滚子