什么是平面波、柱面波和球面波?各有何特点?实际应用的超声波探头发出的波属于什么波?

题型:问答题 简答题

问题:

什么是平面波、柱面波和球面波?各有何特点?实际应用的超声波探头发出的波属于什么波?

考点:无损检测技术资格人员考试超声检测超声检测题库
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John Snow was born and worked as a __36__ in Great Britain.Exactly, he was an anaesthetist,37 means that he put people to sleep during operation.He also began to experiment using the same drugs to help women when they had   38 .That is why he became the doctor who  39 Queen victoria to give the birth of her babies.
At the time he lived,cholera was the most  40 disease.Neither its cause,nor its  41 was understood.So many thousands of people died  42 there was an outbreak.John Snow was  43 to help ordinary people   44  from cholera.He  45  the disease began in the stomach and the patients died quickly after severe vomiting(呕吐)and diarrhea (腹泄).46 ,he believed cholera resulted from water.When another  47 hit London in 1854,John Snow set to work.
John Snow approached the problem in a systematic way.He marked on a map  48 all the dead people had lived and found many of the   49  were near a water pump.It seemed the water was the 50 .So he collected information about the  51 habits of the dead people and used them eventually to prove his theory.With the information  52  ,John Snow was sure  that   53  water was the cause.
Then people were required to 54  the water company to supply them with clean water.Thanks __55___ John Snow there was no more outbreaks of cholera.
小题1:
A.scientistB.an officialC.an officerD.doctor
小题2:A.who           B.that          C which        D.it
小题3:
A.painB.acheC.difficultiesD.babies
小题4:
A.assisted withB.took careC.look afterD.joined
小题5:
A.surprisingB.interestingC.interestedD.frightening
小题6:
A.cureB.methodC.resultD.threat
小题7:
A.each timeB.at one timeC.in no timeD.the first time
小题8:
A.delightedB.devotedC.absorbedD.determined
小题9:
A.sufferedB.having sufferedC.sufferingD.being suffered
小题10:
A.noticedB.was noticingC.has noticedD.had noticed
小题11:
A.ThereforeB.As a result ofC.SoD.According to
小题12:
A.diseaseB.disasterC.outbreakD.case
小题13:
A.howB.whereC.whatD.in which
小题14:
A.womenB.menC.deathD.injuries
小题15:
A.resultB.causeC.originD.case
小题16:
A.drinkingB.1ivingC.workingD.housing
小题17:
A.having collectedB.being collectedC.collectedD.collecting
小题18:
A.being pollutedB.pollutedC.pollutingD.having polluted
小题19:
A.take onB.call onC.depend onD.carry on
小题20:
A.toB./C.forD.on
题型:问答题 简答题

竹叶石膏汤的功用是()

A.清热生津,益气和胃

B.清热泻火,生津除烦

C.清热解毒,疏风散邪

D.泻火解毒,清上泄下

E.泻火养阴,退热除蒸

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赵先生是一家合伙企业的合伙人,他的妻子今年30岁,是一名会计。赵先生的父亲已经过世,赵先生的母亲和赵先生的哥哥生活在一起,赵先生夫妇还有一个5岁的女儿。赵先生在一次车祸中不幸遇难,没有留下任何遗嘱,赵先生一家的总财产价值为300万人民币。

假设赵先生夫妇没有夫妻财产协议,则赵先生的遗产总额为( )。

A.300万

B.150万

C.100万

D.无法判定

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驾驶人通过没有交通标志、标线控制的路口,进入路口前应停车瞭望,让右方道路的来车先行。

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