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【单选题】
对准直器的作用,叙述错误的是
A.
大焦度放少城的干扰
B.
决定扫描层的厚度
C.
减少患者的放射剂量
D.
决定像素的大小
E.
提高图像质量
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【简答题】单词拼写(共10题，每题1分，满分10分) 小题1:__________(祝贺)! You have passed the exam. 小题2:Hearing the news, she burst into __________(笑声). 小题3:People began to wonder how long the __________(灾难) would last. 小题4:I became...
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