【单选题】听力原文:W:The visiting economist is speaking tonight.But Dr. Johnson doesn't seem to think much of him. M:That is because Dr. Johnson comes from an entirely different school of thought. Q:what do we lear...
A.
The visiting economist has given several lectures.
B.
Dr. Johnson and the guest speaker were schoolmates.
C.
Dr. Johnson invited the economist to visit their college.
D.
The guest lecturer's opinion is different from Dr. Johnson's.
【简答题】计算y=Asin(Bx+C),y=Acosx,y=tanx,y=x k (k=1,2,…)的导数。
【单选题】下列函数一定是关于x的二次函数的是 [ ]
【单选题】方程y'+3y'=x2的待定特解y*应取( ).
【单选题】微分方程y"+y=x 2 +1+sinx的特解形式可设为( ).
A.
y * =ax 2 +bx+c+x(Asinx+Bcosx)
B.
y*=x(ax 2 +bx+c+Asinx+Bcosx)
【简答题】函数y=bx+1(b≠0)与y=ax2+bx+1(a≠0)的图象可能是