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Telecommunications
containing
使有
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使用并占有
use and occupancy
使用权占有期
beneficial occupancy date
手机通话时使用扬声器或有线耳机,并使手机尽量与身体保持距离,能有效减少辐射
Using your cell phone's speaker or connecting a wired headset - while keeping the handset away from your body - drastically reduces radio frequency exposure
有效使用期
active life time
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