随系统的开环对数幅频特征如题图所示,将系统I的频带加宽一倍成为系统II,
(a)写出串联校正装置的传递函数Ge(s):
(b)比较两系统的动态性能和稳态性能有何不同。
A.I(v+m)=IIc
B.I(v+△v+m/x)=II(c+△c)
C.I(c+v+m)=I(c+△c)+II(c+△c)
D.II(c+v+m)=I(v+△v+m/x)+II(v+△v+m/x)
A.II级焊缝
B.I级焊缝
C.C都正确
D.当焊缝与作用力间的夹角满足1.5时的焊缝
根据下面的提示,计算积分
(i)关于b∈(-∞,+∞)一致收敛;
(ii)并解微分方程求出通解;
(iii)根据确定出待定常数.
A.I
B.II
C.III
D.I和II
______, I wrote a letter to Henry Ford II and told him what happened.
A.Desperate
B.Despite
C.Inspiring
D.Exciting