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【多选题】
下列关于声场的描述,正确的有()。A.
声场分为近场和远场
B.
近场声束集中，呈规则的圆柱形，但声能分布极不均匀。
C.
远场声束分散，呈规则的圆柱形，但声能分布极不均匀。
D.
远场声束分散，呈喇叭形，但临床上声能分布均匀。
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举一反三
【单选题】. My pain ___________ obvious the moment I walked into the room, for the first man I met asked me pitifully:' Are you feeling all right?'
A.
must be
B.
must have been
C.
could be
D.
could have been
【简答题】听短文，选答案。 1. What did they do on that day? A. They had a meeting. B. They had a party. C. They had a rest. 2. What did the writer want his friends to read? A. Storybooks. B. Chinese books. C. History b...
【单选题】She didn' t know ______ .
A.
where she gets the book
B.
where would she get the book
C.
where getting the book
D.
where to get the book
【简答题】计算机网络卡认识? 2 、计算机网络卡作用?
【判断题】对图像进行切片处理后,可以在切片选项栏中设置切片的名称、尺寸、对齐方式、背景颜色等选项,以及为切片设置链接,使切片在 Web上可以更加有效地应用。
A.
正确
B.
错误
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