问题
单项选择题
设f(x)满足
当x→0时，lncosx2是比xnf(x)高阶的无穷小，而xnf(x)是比
高阶的无穷小，则正整数n等于()。
A．1
B．2
C．3
D．4
答案
参考答案：A
解析：
知，当茗→0时，f(x)～-x2，于是xnf(x)～-n+2。又当x→0时，
再根据题设有2＜n+2＜4，可见n=1。
搜题请搜索小程序“爱下问搜题”
设f(x)满足当x→0时，lncosx2是比xnf(x)高阶的无穷小，而xnf(x)是比高阶的无穷小，则正整数n等于()。
A．1
B．2
C．3
D．4
参考答案：A
解析：
知，当茗→0时，f(x)～-x2，于是xnf(x)～-n+2。又当x→0时，
再根据题设有2＜n+2＜4，可见n=1。
Dahlia was running around the house screaming and crying. “I hate her! I hate her! I will __36__ play with her again!” Finally, her steps slowed, __37__ she told her father what had happened. He listened attentively. __38__ she stopped, he asked, “Is there __39__ else?” Dahlia added more details and began __40__ bitterly again. Father was listening. When Dahlia __41__ talking, he said, “It must __42__ you to be made fun of like this by your best friend Tina.” Dahlia __43__ her father’s embrace（拥抱）and support as she cried __44__ more in his arms. Then as __45__ as the storm of tears began, she was finished. She got up and __46__ announced, “Daddy, did you know that tomorrow Tina and I are going together to the beach? We are __47__ a log house there with Adam and Tom, I will tell Tina before we go that I __48__ ruin her work again, and I’m sure she will be __49__ to me. ” Why was this encounter (sudden meeting) so successful? How did Dahlia __50__ her sadness so completely and realize her responsibility in the matter __51__ her own? There were three main parts in her father’s reaction that __52__ : (A) Attention (B) Respect (C) Trust. He gave his daughter __53__ attention and took her seriously as she __54__ her feelings. He respected her by not coming with words of wisdom, advice or help. He validated（证实）the feelings she __55__ . And he trusted her to do and say what she needed in order to lead herself toward resolution of her emotions.
|