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问题 单项选择题 A1/A2型题

放射性核素显像技术的叙述，错误的是（）

A.显像剂要求标记方便

B.选择合适的射线能量

C.显像最适宜的能量小于150keV

D.放射性核素的化学纯度要高

E.选择最佳显像时间

答案

参考答案：C

解析：显像最适宜的γ射线能量为100～250keV，能量太高会使空间分辨率降低，能量太低则灵敏度下降。

单项选择题

An (71) service bus (ESB) acts as a shared messaging layer for connecting applications and other services throughout an enterprise computing infrastructure. It supplements its core (72) messaging backbone with intelligent tansformation and routing to ensure that messages are passed (73) . Services participate in the ESB using either Web Services messaging standards (74) the Java Message Service. ESBs are increasingly seen by users and analysts as core components in (75) IT.

（75）处填（）。

A．object-oriented

B．service-oriented

C．particular

D．any
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单项选择题

污泥的脱水处理不包括：

A．浓缩
B．压缩
C．干化
D．稳定
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