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請問有關手機上網的原理

Dec 18th 2013, 01:41

請問有關手機上網的原理

日前去中華電信申辦手機上網功能

手機從2G轉成3G

不用安裝線路也能直接用手機上網

感覺很方便

而且比辦公室的WiFi穩定

想請問

1為何手機不用安裝線路就能上網

2是否表示基地台的電磁波很強大

3如此一來

手機是否有會有電磁波的輻射

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