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【单选题】
下列有关18F-FDG PET／CT显像的描述中，正确的是( )A.
在CT及PET采集的全过程中均采用深呼吸
B.
上检查床前饮水目的是在快速清除泌尿系统的显像剂
C.
盆腹腔显像时町口服对比剂，对比剂必须是阳性对比剂
D.
显像的目的是在于鉴别病变的良恶性或生理性摄取
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【单选题】Many large Russian cities, such as Chelybinsk and Irkutsk, have taken _____ to protect their culture. [ ]
A.
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B.
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C.
behavior
D.
act
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