PET检查所使用的显像剂均由__________制备,超短半衰期核素由小型回旋加速器产生,PET设备必须配备_________,这也是PET设备较昂贵的原因之一。
— What would you like to have, meat or fish?
— _____________________.
— ___________________
— Once or twice a week.
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