see2005 發表於 20-4-2009 15:34:07

佢好似問緊MC-.-"

cyris 發表於 20-4-2009 15:55:51

佢好似問緊MC-.-"
see2005 發表於 20-4-2009 15:34 http://www4.nakuz.com/bbs/images/common/back.gif

好明顯唔係mc

LSM 發表於 20-4-2009 20:16:12

radio
ultrasound 好似好高HZ 既...

將軍抽卒 發表於 22-4-2009 10:01:44

睇常識..收音機都係用radio wave架啦...現實生活有邊個例子係用ultrasound黎傳送信息..
不過原來要寫兩個原因..我淨係寫左話行快d...T.T
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查看完整版本: 09 physics radio waves 定 ultrasound -.-?