频谱多普勒检测外周血管，超声入射角如>60°，应如何调节仪器以获得相对准确的速度数据

发布时间：2017-06-02 13:32 │ 来源：www.tikuol.com

题型：单项选择题 A1/A2型题

问题：

频谱多普勒检测外周血管，超声入射角如>60°，应如何调节仪器以获得相对准确的速度数据（）

A.调节速度标尺

B.选用低通滤波

C.选用连续波多普勒

D.校正入射角度

E.调节取样容积大小

考点：超声波医学主治医师 2016版主治医师(超声波医学)基础知识考前冲刺三

题型：单项选择题 A1/A2型题

甲、乙、丙、丁四种元素，甲的单质是空气中含量最多的气体；乙是地壳中含量最多的金属元素；丙是人体中含量最多的元素；丁元素原子核外只有一个电子。则：甲的单质是_______；乙元素是_________；乙和丙形成的化合物是_________；丁的离子符号为_________。

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题型：单项选择题 A1/A2型题

关于力的概念，下列说法正确的是（）

没有相互接触的物体间也可能有力的作用

力是物体位移增加的原因

C. 压缩弹簧时,手先给弹簧一个压力而使之压缩,弹簧压缩后再反过来给手一个弹力

D. 力可以从一个物体传给另一个物体,而不改变其大小

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题型：单项选择题 A1/A2型题

完形填空
One afternoon I was sitting at my favorite table in a restaurant, waiting for the food I had ordered to arrive. Suddenly I 1 that a man sitting at a table near the window kept glancing in my direction, _ 2 he knew me. The man had a newspaper 3 in front of him, which he was 4 to read, but I could 5 that he was keeping an eye on me. When the waiter brought my 6 , the man was clearly puzzled by the 7 way in which the waiter and I 8 each other. He seemed even more puzzled as 9 went on and it became 10 that all the waiters in the restaurant knew me. Finally he got up and went into the 11 . When he came out, he paid his bill and 12 without another a glance in my direction. I called the owner of the restaurant and asked what the man had 13 . "Well, "he said, "That man was a detective(侦探). He 14 you here because he thought you were the man he 15 ." "What ?"I said, showing my 16 . The owner continued, "He came into the kitchen and showed me a photo of the wanted man. I 17 say he looked very much like you! Of course since we know you, we told him that he had made a __18_." "Well, it's really 19 I came to a restaurant where I'm known, "I said. " 20 , I might have been in trouble."
( )1.A. knew ( )2.A. since ( )3.A. flat ( )4.A. hoping ( )5.A. see ( )6.A. menu ( )7.A .direct ( )8.A. chatted with ( )9.A. the waiter ( )10.A. true ( )11.A. restaurant ( )12.A. left ( )13.A. wanted ( )14.A. met ( )15.A. was to beat ( )16.A. care ( )17.A. must ( )18.A. discovery ( )19.A. a pity ( )20.A. Thus	B. unders tood B. even if B. open B. thi nking B. find B. bill B. familiar B. looked at B. time B. hopeful B. washroom B. acted B. tried B. caught B was dealing with B. surprise B can B mistake B natural B However	C. noticed C .though C. cut C. pretending C. guess C. paper C. strange C. laughed at C. I C .clear C. office C. sat down C. ordered C. followed C. was to meet C. worry C. need C decision C. a chance C.Otherwise	D.recognized D.as if D. fixed  D.continuing D. learn D. food  D. funny  D. talked about D. the dinner D. possible D .kitchen D. calmeddown D. wished D. discovered D. was looking for D. regret D. may D. fortune D. lucky D. Therefore

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题型：单项选择题 A1/A2型题

如图所示，用三个钉子A、B、C把一个光滑的圆环挂在竖直墙上，其中A在圆环最高点，C与圆环的圆心等高．下列关于三个钉子受到圆环作用力的说法中有可能的是（　　）

A．只有A、C两个受力

B．只有B、C两个受力

C．只有A受力

D．A、B、C都受力

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题型：单项选择题 A1/A2型题

若有一个仓库，可以存放P1，P2两种产品，但是每次只能存放一种产品，要求：

①w=P1的数量-P2的数量

②-i＜w＜k(i，k为正整数)

若用PV操作实现P1和P2产品的入库过程，至少需要 (9) 个同步信号量及 (10) 个互斥信号量，其中，同步信号量的初值分别为 (11) ，互斥信号量的初值分别为 (12) 。

（9）处填（）。

A．0

B．1

C．2

D．3

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