从事放射源操作的人员必须()。
参考答案:持证上岗
He works in a hospital. When you have got a headache he can help you. What's his job? [ ]
A. A fireman.
B. An actor.
C. A doctor.
编制招募广告内容的主要依据是()
A.招募简章
B.媒体的类型
C.招聘对象
D.职位说明书