如图所示,一带电小球以速度v0水平射入接入电路中的平行板电容器中,并沿直线打在屏

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问题:

如图所示,一带电小球以速度v0水平射入接入电路中的平行板电容器中,并沿直线打在屏上O点上,若仅将平行板电容器上极板平行上移一些后,让带电小球再次从原位置水平射入并能打在屏上,其它条件不变,两次相比较,则再次射入的带电小球(  )

A.将打在O点的下方

B.将打在O点的上方

C.穿过平行板电容器的时间将增加

D.达到屏上动能将增加

考点:平行板电容器带电粒子在电场中运动的综合应用
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根据短文内容判断下列句子的正误,正确的用 "A" 表示,错误的用 "B" 表示。

    In Europe many people died during the Second World War. As a result, at the end of the war there

wcrc manv orphans(孤儿)there.A man called Hermann Gmeiner wanted to help these children. His idea

was simple. He wanted orphans to have a home, and he wanted them to have the care ancl kindness of

parents.  Gmeiner asked people to give him some money.  With this money he built the first SOS Children's Village at Imst, in Austria.  It opened in 1949. This is how the SOS Children's Village started. The

letters SOS stand for "Save Our Souls(灵魂)".This means "Please help us!".An SOS Children's Village

giVeS help to orphans.

    Hermann Gmeiner's idea for helping orphans soon spread(传播)all over the world. By 1983 there were 170 SOS Children's Villages in the world. People in many countries give money to help the villages.Today the children from the first village are grown up. Now some of them work in other SOS Children's Villages.

    In SOS Villages orphans live in family groups. There are several houses in each village. The biggest

villages have 40 0r 50 houses! Between seven and ten children live in a house.  A woman lives with each

groul, of children and looks after them.  She gives the children a lot of love and kindness. She cooks for

them and makes comfortable(舒适的),happy home for them.

    Of' course, the children don't spend all their time in the village. They go. to school, they go out with

their friends and they go into town. But the village gives them a home-sometimes for the first time in heir

lives.

( )l.  An orphan is a child who has no parents; no brother and no sister.

( )2. Gmeiner built the first SOS Children's Village with his own money,

( )3. Some of the children who are grown up work in other SOS Children's Villages.

( )4. There are about 30 houses in the biggest SOS Children's Villages.

( )5. We can conclude(推论)from the article that the money for helping the SOS Villages mainly comes from people in general.

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This is a story  that happened 15 years ago but it has always stayed with me since then.On the way back from work every evening,more often than not there would be a homeless man standing at the exit of the freeway.He always waved at every car,he was always happy and smiling and sometimes almost dancing.Every day after work when I got there,I would quickly roll down my window and give him the coins.Occasionally the red light would be on for a minute and we would ask each other about our day.His answer would always be the same,“I’m blessed!”.

It amazed me that even in his situation of being homeless he was so positive,and his answer would remind me of how blessed I was.A single mother of four amazing kids,with a place to call home and with a job to provide for my kids.Then one day I was called into my boss’s office and was told that I was being laid off due to the economy.Needless to say that on my was home that day I was very sad and upset.I didn’t remember to look for my spare change and keep it ready like I usually did.I wasn’t feeling the joy as I got off the ramp where the homeless man would be.Yet there he was as alway,as l turned the ramp.He set his eyes on me,while still smiling and waving at others.

While I was waiting for the red light to turn,he strolled over to my car.He had a big smile he looked me straight in the eyes and said “today I will give you a dollar”.He then reached into his pocket and pulled out a dollar bill.I was blown away.I burst into tears.I wanted to jump out of my car and hug him!

You see that day he gave me more than a dollar bill,he taught me a valuable lesson.No matter  what material things are taken  from you,no one can take away your choice to be joyful.

小题1:What is the passage mainly concerned?

A.A dollar bill from a homeless person.

B.A blessing coming from a homeless person.

C.A woman who lost her job due to the economy.

D.A homeless man standing at the exit of the freeway.小题2:From the lst paragraph,we know the homeless man is         .

A.optimistic

B.brave

C.Iazy

D.kind-hearted小题3:After leaving the boss’s office,the author         .

A.felt relaxed to get rid of the tiring job

B.still felt joyful when coming off the ramp

C.took it for granted that she was fit for her job

D.didn’t put some change aside to give to the man小题4:The underlined phrase“blown away”in the 3rd paragraph most probably  means

       .

A.completely defeated

B.wholly blown down

C.really amazed

D.murdered by gunfire小题5:It can be inferred from the passage that         .

A.material things are the most important in life

B.people should be encouraged to beg by smiling

C.the author’s ride home that dog was smooth sailing

D.we should wait others’help when faced with challenges

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患者,男性,55岁,因劳累后出现颈项痛,伴左上肢放射痛1周,查体:颈5~胸1棘突及左侧压痛,左臂丛神经牵拉试验(+),霍夫曼征(一)。X线示:颈5~颈7椎体前缘轻度骨质增生,钩椎关节变尖。

为了明确颈部病变性质、程度,做哪项检查最适宜()

A.TCD

B.超声检查

C.肌电图检查

D.上肢神经传导速度检查

E.MRI

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男性,34岁,肛门旁反复疼痛、红肿伴流脓5个月。查体:距肛门缘3cm的皮肤上可触及一直径lcm的硬结,挤压后有少量脓血样分泌物流出,沿硬结于皮下可触及长约3cm的索条状物伸至肛管内

该病人最可能的诊断是()

A.肛裂

B.外痔

C.肛瘘

D.皮质腺囊肿

E.肛门周围癌

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某6500总吨国内航行多用途船在进行安全检查时发电机组能够正常工作,但应急发电机组不能起动,则应对该船进行()处理

A、滞留

B、限制操作

C、责令船舶驶向指定区域

D、未按规定配备固定灭火系统

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