关于空间分辨率的影响因素，下列叙述中正确的是A．频率越高，则_爱下问搜题

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问题单项选择题

关于空间分辨率的影响因素，下列叙述中正确的是

A．频率越高，则纵向分辨率越差

B．实际上，轴向分辨率约为波长的1/2

C．横向分辨率仅与声束宽度有关

D．声束越宽，侧向分辨率越差

E．近场与远场的空间分辨率相同

答案

参考答案：D

解析：侧向分辨率指在与声束轴线垂直的平面上，在探头长轴方向的分辨率，声束越细，侧向分辨率越好，声束越宽，侧向分辨率越差。

单项选择题共用题干题

患者女，35岁，来院体检。查体：BP150/90mmHg；身高160cm，体重75kg；下腹壁及双股内侧有纵行红纹。

为鉴别单纯性肥胖与库欣综合征，应进一步检查（）

A.大剂量地塞米松抑制试验

B.小剂量地塞米松抑制试验

C.美替拉酮试验

D.血浆氢化可的松

E.血浆氢化可的松昼夜节律

完形填空

I first went to hear a live rock concert when I was eight years old. My brother
and his friends were all 36 of a heavy metal group called Black Wednesday. When they 37 that Black Wednesday were going to perform at our local theatre, they all bought 38 for performance. However, at the last minute, one of the friends couldn’t go, so my brother 39 me the ticket. I was really 40 !
I remember the buzz (嘈杂声) of excitement inside the theatre as we all found our 41 . After a few minutes, the lights went down and everybody became 42 . I could barely make out the stage in the 43 . We waited. Then there was a roar from the crowd, like an explosion, as the first members of the band 44 the stage. My brother leaned over and shouted something in my ear, but I couldn’t 45 what he was saying. The first song was already starting and the music was as 46 as a jet engine. I could 47 the drum beats and bass notes in my stomach.
I can’t recall any of the songs that the band played. I just 48 that I really enjoyed the show and didn’t want it to 49 . But in the end, after three encores (加演), the show finished. We left the 50 and walked unsteadily out onto the pavement. I felt a little dizzy, as if I had just 51 from a long sleep. My ears were still 52 with the beat of the last song.
After the 53 , I became a Black Wednesday fan too for a few years before getting into other kinds of music. Once in a while, 54 , I listen to one of their songs and 55 I’m back at that first show.

C．embarrassed

A．comfortable

B．got through

C．stepped onto

A．competition

B．performance

D．celebration