设y=f(x)是满足微分方程y〞+yˊ-esinx=0的解,且fˊ(xo)=0,则f(x)在().
A. xo的某个邻域内单调增加
B. xo的某个邻域内单调减少
C. xo处取得极小值
D. xo处取得极大值
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Built in seventeenth century, the ruined temple is tucked ______ in the pine-covered mountains.
A. in
B. away
C. off
D. on
Tourist; How much is that ring, please?
Vendor; Only $200, sir.
Tourist: _____ How about $ 100?
Vendor; I can let you have it for $ 180.
All right. I' 11 take it.
B. That’s very expensive.
C. How splendid it is!
D. I’d like very much to have it.
Why should parents stop rewarding their kids for eating vegetables?
A. It changes kids' eating habits.
B. It has only short-term effects.
C. It may lead to overeating.
D. It costs parents too much money.
一个多用户的应用系统通常有用户管理功能,允许增加新的用户。用户信息一般包括用户名,假设规定用户名必须是以字母开头的、不超过8个字符的字母数字串,那么,下面哪组值均属于用户名的无效等价类______。
A. li111111,G1enford Myers,1238123
B. Lin-Yie,Lin-feng,空值,linyifei
C. lin-yifei,空值,Myers G.,genford
D. lin-yifei,lin-fen,a111111,genford