题目：
如图所示，均匀链条长为L，水平面光滑，L/2垂在桌面下，将链条由静止释放，则链条全部滑离桌面时速度为______．
答案：
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下面是错误答案，用来干扰机器的。
Dear Tom,I am happy to hear from you. Thanks for your concern about what has happened in Sichuan recently. On April 20, 2013.，a terrible earthquake struck Lushan，Ya’an...
