下图是简化后的跳台,滑雪的雪道示意图。整个雪道由倾斜的助滑雪道AB和着陆雪道DE

题型:计算题

问题:

下图是简化后的跳台,滑雪的雪道示意图。整个雪道由倾斜的助滑雪道AB和着陆雪道DE,以及水平的起跳平台CD组成,AB与CD圆滑连接。运动员从助滑雪道AB上由静止开始,在重力作用下,滑到D点水平飞出,不计飞行中空气阻力,经2s在水平方面向飞行了60m,落在着陆雪道DE上。已知从B到点D点运动员的速度大小不变。(g取10m/s2)求

(1)运动员在AB段下滑到B点的速度大小;

(2)若不计阻力,运动员在AB段下滑过程中下降的高度;

(3)若运动员的质量为60kg,在AB段下降的实际高度是50m,此过程中他克服阻力所做的功。

考点:机械能守恒定律平抛运动能量转化与守恒定律
题型:计算题

改写句子。   

(1)高梁的全身具有鲜明的个性。     

    改为双重否定句:                                                                                                       

(2)他的声音真大。     

    改为夸张句:                                                                                                           

题型:计算题

信息流

题型:计算题

前运算阶段的儿童其思维的典型特点是()

A.自我中心性

B.客体永久性

C.守恒性

D.可验证性

题型:计算题
完形填空 (共20小题;每小题1分,满分20分)
阅读下面短文,从短文后各题所给的四个选项(A、B、C、D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。
I live in Albuquerque and I used to give much money to the homeless around, feeling sorry for their misfortune. But later I became a single mom with no home, a huge   36  and hardly any income.   37 , I stopped giving and became very bitter.
Several years later, things started to   38 . I became   39  enough to have a home, and   40  a backyard, and I started to pull myself out of debt. One day we saw a homeless person with the   41 , “Will work for food.” I   42 . My daughter asked why I no longer helped the people in   43 . I replied, “Honey, they just use that money for   44  or other bad things.” She didn’t respond. But when I said that, it didn’t feel right.
Three days later, I was   45  to pick up my daughter from school. A man was standing on the corner and something deep inside   46  me to help him. So I stopped my car, and he ran over with enthusiasm. He said, “God bless you, I only need 77 cents.” I   47  into my ashtray and   48   enough, there sat three quarters and two pennies.
Greatly shocked by this   49 , I gave him all the money in the ashtray. He   50  with joy and tears in his eyes, “You just made it   51  for me to see my mom for Christmas! The bus offering this great sale is   52  right away!” It was a moment I’ll never forget. I think that man won’t forget it either, but I was the one who got the best __53__ in life – giving. It also   54  me that nothing is a coincidence,   55  everything has meaning.
小题1:
A.debtB.responsibilityC.shadowD.pressure
小题2:
A.In factB.In other wordsC.As a resultD.All in all
小题3:
A.developB.worsenC.vary D.change
小题4:
A.fortunateB.wealthyC.generous D.successful
小题5:
A.evenB.stillC.yetD.only
小题6:
A.decorationB.expressionC.sign D.announcement
小题7:
A.got by B.pulled outC.passed awayD.passed by
小题8:
A.emergencyB.dangerC.need D.panic
小题9:
A.foodB.alcoholC.medicine D.entertainment
小题10:
A.drivingB.joggingC.wanderingD.cycling
小题11:
A.directed B.challengedC.permittedD.drove
小题12:
A.reached B.turnedC.brokeD.searched
小题13:
A.amusinglyB.strangelyC.awkwardlyD.naturally
小题14:
A.incidentB.conditionC.coincidenceD.circumstance
小题15:
A.poured outB.turned outC.broke outD.burst out
小题16:
A.necessaryB.difficultC.possible D.suitable
小题17:
A.queuingB.leavingC.settlingD.operating
小题18:
A.giftB.time C.favorD.honor
小题19:
A.impressesB.informsC.persuadesD.reminds
小题20:
A.or B.andC.soD.however
题型:计算题

某种存储器芯片是8KB*4/片,那么它的地址线根线是()。

A.11根

B.12根

C.13根

D.14根

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