外照射防护通常可采用：（）
A、尽量缩短受照射时间，尽量增大与辐射源的距离，在人和辐射源之间加屏蔽物A
暂无解析
Newsmediaareimportantinmodernsociety.Whyaretheysoimportant?Aretheirinfluencesgenerallypositiveornegative?
Thespeakersuggestsostrichfarmsareprofitablebecause____
Rulesandregulations
Ourusualtermsofpaymentarebyconfirmed,irrevocableletterofcreditinourfavour,reachingusonemonthaheadofshipment.
Workisanimportantdeterminateofhealth.Itcaninfluencehealthpositivelyornegatively.
