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岁月流逝总是会冲刷掉许多记忆,有一件事我却总也忘不了,因为,它让我知道了“君子一言,驷马难追”的道理。记得那天上语文课,杨老......
A solar panel is described,in which thin films of semiconductor are deposited onto a metal substrate.The semiconductor-m......
