单项选择题

辐射致癌的相对危险（RR）是

A.受照人群癌症发病率与对照组或参照人群发病率之比
B.受照人群癌症实际发生例数与该人群期望发生例数之比
C.受照人群的大小与对照组或参照人群的大小之比
D.受照人群癌症发病率与对照组或参照人群发病率之差
E.受照人群癌症发病数与对照组或参照人群发病数之差
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a.Such a language could be accepted by people around the world and used when necessary.b.This is because there are over 3,000 languages used in the world today.c.It is the opinion of many people that the world badly needs one politically neutral language.d.This problem could be solved if there were a universally established “politically neutral language”.e.Obviously, it is very difficult for people with different native languages to communicate with one another.f.In other words, it would enable people who speak different languages to communicate with each other more easily.The following sentences are from a paragraph, but they are in the wrong order.Choose the correct order from A, B, C, and D.______A、b-d-a-e-f-cB、c-a-b-e-d-fC、c-b-e-d-a-fD、b-c-a-f-e-d
单项选择题
辐射致癌的绝对危险（AR）是
A.受照人群癌症发病率与对照组或参照人群发病率之比
B.受照人群癌症实际发生例数与该人群期望发生例数之比
C.受照人群的大小与对照组或参照人群的大小之比
D.受照人群癌症发病率与对照组或参照人群发病率之差
E.受照人群癌症发病数与对照组或参照人群发病数之差
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