增强超声造影效果,采用间歇式成像,其原理是什么() A.超声探头间断发射,增加造影剂

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问题:

增强超声造影效果,采用间歇式成像,其原理是什么()

A.超声探头间断发射,增加造影剂聚积量

B.造影剂产生谐振

C.造影剂一次谐振被接收

D.用药物使血流加速

E.增加超声发射频率

考点:江苏住院医师儿外科B超B超题库
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阅读下面短文,根据以下提示:1)汉语提示,2)首字母提示,3)语境提示,在每个空格内填入一个适当的英语单词。所填单词要求意义准确,拼写正确。

We moved away from my grandmother when 1 was eight years old. 小题1:  her terribly.Two years later my mother and father___小题2:___(离婚).I felt as if my world was falling apart.So Mother took my little brother and me back to visit my Granny once in a 小题3:   .

Granny didn’t live in a fancy house  小题4: have expensive things.But it was the little things she gave me that had always mattered.1 will always remember she saved her pennies in a glass jar .I am sure Granny could have  used those pennies 小题5:  but she saved them to give us when we came to visit.I don’t remember how much we collected on our visits.

Those小题6:   (记忆),of when 1 was a child,still give me  w 小题7: feelings on days that I need them.A Granny’s love stays小题8:  a grandchild,down through the years,even when that child becomes a grandma.I often wonder,after all those years,when I am lucky 小题9:  to find a penny  小题10: on the ground somewhere, if it could possibly be Granny giving me pennies from heaven.

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化学纤维制针织或钩编男式滑雪套

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中国现代文学史上,第一个女作家是(),其作品是(),除了她和冰心、庐隐外,第一个十年的知名女作家还有《隔绝》的作者()。

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各种费用的标准是多少?

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加入提供勤助岗位的用户有个人、单位两种。从面向对象的方法来看。下列论述中正确的是()。

A.个人用户和单位用户的属性和行为相同

B.在个人用户类中增加一个属性,则也必须在用户类中增加同样的属性

C.用户类是个人用户类的超类

D.用户类继承了个人用户类

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