CLEAN ENERGY!!!

HOW TO MAKE A COMPLETE CIRCUIT.....

CLICK HERE
http://www.oswego.edu/~dristle/PHY_206_powerpoints/Electric_Circuits10.9t.pdf

TOPIC 2: ABOUT ELETRICITY

http://www.youtube.com/v/D2monVkCkX4&fs=1&source=uds&autoplay=1

要听故事， 请点击
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