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【单选题】
正电子发射断层扫描设备( PET )中采用的放射性同位素要现场生产是因为
A.
放射性同位素放长时间不新鲜
B.
采用的放射性同位素半衰期太短
C.
成本低些
D.
可以提高分辨率
举报
参考答案：
参考解析：
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【单选题】Mars fascinates scientists because of its similarity to Earth, and it fascinates the public because our myth of "Martians" is a vision of life beyond Earth. The Mars 62 continues with the launch of ...
A.
extremes
B.
extracts
C.
terminals
D.
radicals
【单选题】Mars fascinates scientists because of its similarity to Earth, and it fascinates the public because our myth of "Martians" is a vision of life beyond Earth. The Mars 62 continues with the launch of ...
A.
thus
B.
however
C.
so
D.
but
【单选题】上述哪些核素是从加速器中生产的非正电子发射核素（）
A.
131I、99Mo、131Xe
B.
99Mo、125I、51Cr
C.
111In、67Ga、201Tl、123I
D.
18F、11C、15O
E.
99Mo-99mTc、188W-188Re