when the torch at the sender side got lit, the sensor sends
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送交者: steven 于 2008-04-04, 13:01:21:
回答: 激光变火苗好办，火苗怎么变成激光? 由 Amsel 于 2008-04-04, 12:53:40:
a signal to the transmitter which sends signal to the satellite and forwards to the destination.
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