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【单选题】
CT成像原理利用的是A.
多方位成像特性
B.
横断面图像显示特性
C.
数据采集系统特性
D.
X线的吸收衰减特性
E.
X线透过被照体之后的直进性
拍照语音搜题，微信中搜索"皮皮学"使用
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A.
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B.
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C.
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D.
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【单选题】发射天线的作用是:
A.
把无线电发射机输出的射频信号电流转换为空间的电磁波
B.
通过天线的增益对无线电发射机输出的射频信号加以放大
C.
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D.
把无线电发射机输出的射频信号电流转换为热能
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