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  ______     ___               __   __    _____   
 /_   _//   / _ \\    ____     \ \\/ //  / ____|| 
   | ||    / //\ \\  |    \\    \ ` //  / //---`' 
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 /__//    |_||  |_|| |  __//     |_||    \_____|| 
 `--`     `-`   `-`  |_|`-`      `-`'     `----`  
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發送短信 : Exploring students' conceptions of forces in uniform circular motion