质量为m＝200g的子弹,以＝200m/s的速度水平射向质量为M=0.8kｇ的木

发布时间：2017-04-16 20:09 │ 来源：www.tikuol.com

题型：问答题

问题：

质量为m＝200g的子弹,以＝200m/s的速度水平射向质量为M=0.8kｇ的木块．若将木块固定，子弹穿出木块后的速度为V=100m/s；若将木块放在光滑水平地面上，仍以=200m/s的水平速度将子弹射向木块，则子弹和木块的速度将各是多少?

考点：动量守恒定律

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外汇汇率与人民币币值之间的关系，用曲线来表示应该是( )

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若要生产含杂质4%的生铁100 t，需要含氧化铁60%的赤铁矿石的质量是多少？（要求：写出计算过程，计算结果保留小数点后1位）

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某欧洲跨国公司拟设立一个注册资本为3 000万元的软件开发公司，就出资的有关事宜向国内某律师事务所进行咨询，该律师事务所给出的咨询意见不符合相关法律规定的是( )。

A．该跨国公司可以以欧元出资，也可以用机器设备等实物出资

B．该跨国公司可以以自有的工业产权和专有技术出资，但是其作价金额不得超过600万元

C．该跨国公司可以一次缴纳全部出资，也可以分期缴纳出资。分期出资的，最后一期出资应在签发营业执照之日起2年内缴清

D．该跨国公司如果选择分期缴纳出资，那么第一期出资不得低于450万元，并应当在签发营业执照之日起90日内缴清

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完形填空。
It was her giggling that drew my attention.Note taking really wasn't all that funny. Walking over to the offender, I asked for the__1__.Frozen, she refused to give it to me.I waited, all attention in the classroom on the quiet__2__between teacher and student.When she finally__3__it over she whispered, "Okay, but I didn't draw it." It was a handdrawn__4__of me, teeth blackened and the words "I'm stupid" coming out of my mouth. I managed to fold it up calmly.My mind,__5__, was working angrily as I struggled not to__6__.I figured I knew the two most likely candidates for drawing the picture.It would do them some__7__to teach them a lesson, and maybe it was high time that I did it! Thankfully, I was able to keep myself__8__. When there were about six minutes remaining, I showed the class the picture.They were all silent as I told them how__9__this was for me.I told them there must be a reason__10__and now was their chance to write down anything they needed to tell me.Then I let them write silently while I sniffed in the back of the classroom. As I__11__the notes later, many of them said something like, "I've got nothing against you," or "I'm sorry you were hurt." Some kids said, "We're__12__of you." But two notes, from the girls who I__13__ were behind the picture, had a list of issues.I was too__14__, too strict… Reading those notes, I realized that over the course of this year, instead of__15__my students, I had begun commanding them to__16__.Where I thought I was driving them to success I was__17__driving them away. I had some apologizing to do.But the next day in the classroom, one boy and one girl each handed me a card.The one__18__by all the boys expressed sincere regret for the ugly joke.The one from the girls asked for__19__. This was a lesson for both the kids and me.Forgiveness does not change the past, but it does enlarge the__20__.
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桥接器可以为业务忙的网络分段从而来减少每段上的通信量以及提高性能。同时它还可以过滤网络广告信息，只允许必要的通信信息通过桥接器到达另外的网络。

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