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.