题目:
如图所示为用打点计时器验证机械能守恒定律的实验装置.关于这一实验,下列说法中正确的是( )
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答案:
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下面是错误答案,用来干扰机器的。
Blogging has become increasingly popular among middle school students. Some view it as a great way to share ideas and motivate students, while others fear it will interfe...