— Will it be sunny tomorrow?
— ____. [ ]
A. Yes, it will
B. Yes, it was
C. Yes, it is
答案:A
设f(x)在[0,1]上二阶连续可导,且f’(0)=f’(1).证明:存在ξ∈(0,1),使得
在吊装圆形预制桩时应采用怎样的索具?