生物有效剂量（biologically effictivedose）/靶剂量（targetdose）

A、致死剂量

B、内剂量

C、靶剂量

D、绝对剂量

E、阈剂量

F、吸收剂量

Biological Clock When the sun rises on a warm and sunny day, you can see some flowers open up. When they close late in the afternoon, other flowers open. Biological rhythms（生物节律）, like the opening and closing of flowers, happen all over nature. But not all of them are daily rhythms. Some, like the beating of our heart, happen every second.______（26） Scientists use the term biological clock to describe the timing that controls biological rhythms.______（27）In some animals it is probably controlled by the brain. In plants and other living things that have no brain, it must be something else. The migration of animals happens when a signal sent out. For example, when days become shorter, birds leave the northern parts of the world and fly south where it is warm.______（28） Humans also have biological clocks that control their daily rhythms. When people travel by plane from one continent to another, they often cross many time zones. Their internal clocks don’t seem to work correctly. We call this jet lag（时差）.______（29）People who work night shifts also have problems with their biological clocks. They may not be as active as people who work during the daytime. Biological clocks control many rhythms of life.______（30）Doctors are looking for new ways to make travelling more comfortable and medical treatment more effective. ______.A.But where can you find it？

B.This makes them feel tired.

C.In the summer they fly back to have babies.

D.We are learning more and more about them.

E.Biological clocks can be adjusted.

F.Other rhythms are based on months, seasons or years.

______.A.But where can you find it？

B.This makes them feel tired.

C.In the summer they fly back to have babies.

D.We are learning more and more about them.

E.Biological clocks can be adjusted.

F.Other rhythms are based on months, seasons or years.

______.A.But where can you find it？

B.This makes them feel tired.

C.In the summer they fly back to have babies.

D.We are learning more and more about them.

E.Biological clocks can be adjusted.

F.Other rhythms are based on months, seasons or years.

______.A.But where can you find it？

B.This makes them feel tired.

C.In the summer they fly back to have babies.

D.We are learning more and more about them.

E.Biological clocks can be adjusted.

F.Other rhythms are based on months, seasons or years.

______.A.But where can you find it？

B.This makes them feel tired.

C.In the summer they fly back to have babies.

D.We are learning more and more about them.

E.Biological clocks can be adjusted.

F.Other rhythms are based on months, seasons or years.

A. 有效剂量是用于辐射防护管理的一个基本概念

B. 有效剂量是定量描述辐射对人体产生的随机效应的唯一的量

C. 用来对辐射导致的生物效应进行直接评价

D. 有效剂量数值不是针对具体人的剂量

E. 而是针对参考人的

下列常用于与¹⁸F-FDC结合勾画肿瘤生物靶区，确定最佳治疗视野的放射性乏氧显像剂为（）

A.^99mTc-DG

B.¹⁸F-FMISO

C.¹⁸F-FFT

D.¹⁸F-FES

E.¹⁸F-NaF

可在原核细胞中表达，在人体内穿透力强的是（）

可将生物活性物质导向靶细胞特定部位的是（）

能降低异源性，有利于应用人体的是（）

A. 抗体融合蛋白

B. 双特异性抗体

C. 人源化抗体

D. 小分子抗体

E. 抗体库技术

B．RNA

C．蛋白质

D．基因