四色印刷中常用的加网角度怎样?

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问题:

四色印刷中常用的加网角度怎样?

考点:平板印刷工考试平版印刷工理论知识平版印刷工理论知识题库
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World Book Day falls on April 23 every year. It was set up by UNESCO
(联合国教科文组织) in 1955 to encourage people, especially teenagers, to discover the pleasure of   . Many countries celebrate World Book Day. World Book Day is also celebrated in China.
Reading can benefit people    . Reading helps us become more knowledgeable and more intelligent. Reading helps us to follow the  developments of science and technology. Reading    us with information about other culture and places of the world. When we read, we may find many things  
     are unfamiliar to us. We would have to use our brain      about them or do more reading to find out the answers. The more we read, the more we know. The more we know, the     we become. Reading is also one of the most important ways to learn a foreign language    English. We all know that we     learn everything at school, for example, the ways English people are speaking and writing today.
“Reading makes a full man.”Books, magazines, newspapers and other kinds of reading materials can help to know more about the outside world and perfect us.     , it is necessary for us to form the habit of reading every day.

小题1:
A.listeningB.SpeakingC.ReadingD.writing
小题2:
A.in many waysB.by the wayC.in any wayD.in the way
小题3:
A.EarlierB.LaterC.LatestD.last
小题4:
A.SharesB.GetsC.OpensD.provides
小题5:
A.ThoseB.thatC.WhereD.how
小题6:
A.ThinkB.to thinkC.TalkD.to talk
小题7:
A.OutstandingB.prettierC.SmarterD.outgoing
小题8:
A.LikeB.atC.AboutD.towards
小题9:
A.CanB.can’tC.MightD.have to
小题10:
A.SoB.HoweverC.Now thatD.Therefore
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“山中之王”老虎的食性是(  )

A.肉食性

B.植食性

C.杂食性

D.腐食性

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在Windows Vista研制成功后,微软的步伐并没有停息。他们研发了界面更加绚丽,内核更加完善、更加安全的操作系统Windows 7,这种不断创新的精神是微软不断走向成功的重要原因。这启示我们

①要敢于否定自己,自己发展自己 

②要发扬大胆抛弃一切的革命批判精神

③创新是永无止境的       

④创新推动社会制度的变革

A.①③

B.②③

C.③④

D.①②

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像打点计时器一样,光电计时器也是一种研究物体运动情况的常见计时仪器,其结构如图甲如示a、b分别是光电门的激光发射和接收装置。当有物体从a、b间通过时,光电计时器就可以显示物体的挡光时间。现利用图乙所示装置设计一个“探究物体运动的加速度与合外力、质量关系的实验,图中NQ是水平桌面、PQ是一端带有滑轮的长木板,1、2是固定在木板上的两个光电门(与之连接的两上光电计时器没有画出).小车上固定着用于挡光的窄片K,让小车从木板的顶端滑下,光电门各自连接的计时器显示窄片K的挡光时间分别为t1和t2

(1)用游标卡尺测量窄片K的宽度d(已知l>>d),光电门1,2各自连接的计时器显示的挡光时间分别为t1、t2.则窄片K通过光电门1的速度表达式v1=_______      

(2)用米尺测量两光电门间距为l,则小车的加速度表达式a=_______           

(3)该实验中,为了把砂和砂桶拉车的力当作小车受的合外力,就必须平衡小车受到的摩擦力,正确的做法是_______________                      __.

(4)实验中,有位同学通过测量,把砂和砂桶的重力当作小车的合外力F,作出a-F图线,如图丙中的实线所示.试分析:图线不通过坐标原点O的原因是________  ;曲线上部弯曲的原因____

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人类活动对生物种群动态变化有哪些影响?

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