以下关于信息理论在射线照相方面的论述,哪一条是错误的()A.所谓“噪声“即是底片的颗

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问题:

以下关于信息理论在射线照相方面的论述,哪一条是错误的()

A.所谓“噪声“即是底片的颗粒度

B.信噪比是指缺陷影象对比度ΔD与噪声σD之比

C.只要信噪比大于1,缺陷就能够识别

D.信噪比越大,缺陷识别就越容易

考点:无损检测技术资格人员考试射线检测射线检测题库
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Do you often think of your parents? You may say, ‘‘Of course, I     . I       a gift for my mother on Mother’s Day and on Father’s Day I give my father      , too.’’ But what about the other days of the year?
In my family, my parents like       very much because my aunt and uncle come back from Beijing to see them. All the family members get together. They are very happy. In the evening, we eat moon cakes and watch the     .
I have a friend. Her parents       in another city. One day, I go to see her, and we have a nice talk. Then she wants to     . So she dials(拨打) the number, but then she puts down the phone.      about 15 minutes, she dials the number again. ‘‘Hi, Mom….’’
Later, I ask, ‘‘Why do you dial the number      ?’’ She smiles, ‘‘My parents are old and , so they can't get close to the telephone quickly. I always do so when I call them. I only want to give them       time to      the telephone.’’
My friend is a good girl. She is always     about her parents. You also want to be a    child, right? Please always remember to       your parents at any time, not just on some important days.
小题1:
A.willB.do C.won’t D.don't
小题2:
A.buyB.sellC.takeD.do
小题3:
A.a cakeB.a kissC.some moneyD.a gift
小题4:
A.Halloween B.Chinese New YearC.Thanksgiving DayD.Mid-Autumn Festival
小题5:
A.moonB.sunC.TVD.film
小题6:
A.liveB.playC.travelD.eat
小题7:
A.make a call B.go fishing C.take a walkD.have a rest
小题8:
A.AfterB.WhenC.BeforeD.For
小题9:
A.a twiceB.twiceC.secondD.the second
小题10:
A.slowB.fastC.healthyD.strong
小题11:
A.enoughB.littleC.anyD.free
小题12:
A.move(移动)B.bringC.takeD.answer
小题13:
A.tellingB.sayingC.thinkingD.waiting
小题14:
A.wellB.cleverC.badD.good
小题15:
A.callB.loveC.wantD.hear
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1979年甲单位以土地使用权为条件与乙单位合作建房,根据《确定土地所有权与使用权若干规定》,土地使用权()

A.属于甲单位

B.属于乙单位

C.根据批准文件确定

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E.根据投资数额确定

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A.总体设计文件
B.初步设计文件
C.技术设计文件
D.施工图设计文件

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