设函数f(x)=-x3-2mx2-m2x+1-m(其中m>-2)的图象在x=2处

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问题:

设函数f(x)=-x3-2mx2-m2x+1-m(其中m>-2)的图象在x=2处的切线与直线x-5y-12=0垂直.
(Ⅰ)求函数f(x)的极值与零点;
(Ⅱ)设g(x)=
1-x
kx
+lnx,若对任意x1∈[0,1],存在x2∈(0,1],使f(x1)>g(x2)成立,求实数k的取值范围.
考点:函数的零点与方程根的联系函数的单调性与导数的关系函数的最值与导数的关系
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计划生育中,常采用结扎输卵管的措施以达到避孕的目的,其原理是[ ]

A.使卵细胞不能受精

B.使精子不能进入子宫

C.使卵细胞不能形成

D.使雌雄激素不能分泌

题型:解答题

Many parents have learned the hard way that what sounds like open communication is otfen the very thing that closes a youngster’s ears and mouth, One common mistake is the Lecture, the long monologue that often starts with “When I was your age……”Eighteen –year –old Kelly calls lectures “Long , one-side discussions in which I don’t say much.”

Kids reflexively(条件反射地)shout down in the face of a lecture , Their eyes glaze over(呆滞),and they don’t register any incoming information , Listen to 13-year –old Sarah describe her least favorite times with her mom and dad, “First, they scream, Then comes the“We’re so disappointed’ speech , Then the ‘I never did that to my parents’ lecture begins , After that, even if they realize how ridiculous they sound, they never take it back’”.

Lines like “When you have children of your own, you’ll understand” have been seriously said by parents since time immemorial, But many of our expert parents, like Bobby , a registered nurse and mother of three, feel that by falling back on cliches(陈词滥调)to justify our actions, we weaken our position.

Since kids are creatures of here and now, the far-off future has no relevance to them, Therefore ,good communicators like Bobby suggest, “Give specific reasons for your actions in present language:‘I’m not letting you go to the party because I don’t think there will be enough adult supervisions(监护)”。

Betty, who lives in Missouri ,uses and indirect approach, “I find that warnings are accepted more readily if I discuss a news article on a subject I am concerned about, My husband and I talk about it while our children absorb the information, Then they never think I’m preaching(布道)”.

This really helped when Betty’s kids began driving , Instead of constantly repeating “Don’t drink; don’t speed”, She would talk about articles in the paper and express sympathy for the victims of a car crash, Betty made no special effort to draw her kids into the conversation, She depended on a teenager’s strong desire to put in his opinions—especially if he thinks he isn’t being asked for them.

小题1:The purpose of the passage is to       

A.compare two ways of parents’ communicating with their kids

B.give parents advice on how to communicate with their kids

C.explain why kids won’t listen to their parents

D.introduce kids’ reaction to the communication between them and their parents小题2:Which of the following statements is NOT right?

A.Kids won’t listen to their parents because they think what their parents say is boring

B.Many kids think they have no right to express their own opinions

C.Some kids think their parents should apologize when they are wrong

D.Kids don’t like any discussion at all.小题3:What does the underlined word in the first paragraph mean?

A.独白

B.对话

C.插话

D.讨论小题4:Which of the following topic may appeal to kids?

A.Parents own experience

B.Kids possible life in the future

C.Something related to kids’ present life

D.What parents have done to their own parents小题5:In order to make kids follow their advice, parents should       

A.tell their kids to listen carefully

B.set out their warnings directly

C.list out as many examples as possible

D.arouse kids’ desire to express themselves

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钢中非金属夹杂物的主要来源有哪些?

题型:解答题

下列那一个指令可以用来关机?()

A.poweroff

B.shutdown

C.reboot

D.closeboot

题型:解答题

经皮激光椎间盘减压术主要适应证是()。

A.老年人的腰椎间盘突出症,不宜手术者

B.退行性腰椎病,椎管狭窄者

C.脊髓性颈椎间盘突出症

D.无明显脱出的膨隆性突出,根性症状明确者

E.腰椎间盘脱出继发椎管狭窄,不宜行化学溶解术者

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