建立和充实“干预的辐射防护体系”，仍要充分贯彻在实践中建立的辐射防护基本原则;同时，对持续照射情况()。

多项选择题从事开放型放射性物质的操作，称为开放型放射工作。进行开放型放射工作时应考虑()。

单项选择题Which of the following may not be the main elements of culture news? A. the explanation of noun concept B. statistics that support a cultural event C. more examples to explain a cultural phenomenon D. reasons for and influence of a cultural news