如果脉冲重复频率是10kHz,下面哪种多普勒频移可导致混叠()。 A.2kHz B.

题型:单项选择题 A型题

问题:

如果脉冲重复频率是10kHz,下面哪种多普勒频移可导致混叠()。

A.2kHz

B.3kHz

C.4kHz

D.5kHz

E.6kHz

考点:超声波医学与技术(主管技师)超声主管技师基础知识综合练习超声主管技师基础知识综合练习题库
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根据对话情景和内容,从对话后所给的选项中选出能填入空白处的最佳选项。选项中有两项为

多余选项。

Jack: It's good to see you again. You are an engineer, aren't you? 1._____

Michael: No. I worked in Canada for two years. It's a good place.

Jack: That sounds interesting, but I'm sure you are glad to be back. 2._____ 

Michael: I've been seeing old friends, visiting my family, buying things for my new flat and just having

             a holiday.3._____.

Jack: Haven't you got another job?

Michael: Yes. 4._____ But what about you?

Jack: I've got a job in a company that sells office equipment-paper, typewriters-you know the sort of thing.

        5._____ but I'm a salesman and I've been traveling all over Europe for the last two years, I'm still

        traveling and still selling. I like working abroad.

A. It may sound rather dull.

B. I enjoyed myself there very much

C. How do you like your job?

D. What have you been doing since you came back?

E. Did you stay in England after you left the university?

F. I started working here a week ago.

G. I have been really busy these days.

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透射电子显微镜

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计算:

2x5·(-x)2-(-x23·(-7x)。

题型:单项选择题 A型题

老年疾病的特点不包括()

A.起病隐匿,病情变化快

B.常多种疾病并存

C.易发生医源性损伤

D.临床表现典型

E.易发生多器官功能衰竭

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对单纯性三酰甘油增高的患者,饮食应该严格限制

A.动物脂肪

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