A、 which
B、 what
C、 that
D、 of
答案：C
A、 which
B、 what
C、 that
D、 of
答案：C
A. which
B. what
C. that
D. of
解析：解析:本题考查的知识点为微分方程通解的概念.微分方程为y＇=0.dy=0.y=C.
A. x2+C
B. x2-x+C
C. 2x2+x+C
D. 2x2+C
解析：解析:
A. 单调增加且为凹
B. 单调增加且为凸
C. 单调减少且为凹
D. 单调减少且为凸
解析：解析:本题考查的知识点为利用一阶导数符号判定函数的单调性和利用二阶导数符号判定曲线的凹凸性.
A. will see
B. be seen
C. have seen
D. have been seeing
