Hangzhou Wu Jing Genshan secondary students do not have invented a battery flashlight, rechargeable flashlight as long as shaking a few on the trip, cost is not high. She said this particularly suitable for wild camping torch of ALICE.
Wu Jing is Grade three this year, self-study to go home late, dark corridor so that she [...]
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Senior high school students invented a flashlight,not using battery to light
February 8th, 2009
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