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  3. Radio signals for the next generation of mobile phone services can cause headaches. A study was carried out recently by the D

Radio signals for the next generation of mobile phone services can cause headaches. A study was carried out recently by the D

admin2009-05-28  48
问题    Radio signals for the next generation of mobile phone services can cause headaches.
   A study was carried out recently by the Dutch Technological Research Institute. The study was the first to look for the impact of mobile phones on health. It was als
选项 A、do not receive signals transmitted with an electromagnetic field
B、can receive signals from a larger area than 3G mobile phone
C、cause worse impact when they are used close to the head
D、have no negative impact on human health
答案D
解析
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