PET检查必须使用能够产生___________的超短半衰期核素制备的显像剂,这类显像剂引入人体之后,根据该显像剂的特定__________,按照一定的规律,在人体内分布,且随时间发生一定变化。
— What would you like to have, meat or fish?
— _____________________.
— ___________________
— Once or twice a week.
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