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6Â¥: Originally posted by drlshn at 2015-02-28 07:36:28
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8Â¥: Originally posted by pippi6 at 2015-02-28 08:07:02
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7Â¥: Originally posted by feixiaolin at 2015-02-28 08:03:42
if x=2*t
dx=2*dt  <---------> x'=2
L=L=L*dt

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