As you know, the correct answer is 9.8, but we don't want to use the calculator now so we'll call it -10.
当然大家都知道,事实上应为9.8,但我们目前不想用计算器,所以我们就取-10
耶鲁公开课 - 基础物理课程节选
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模块上移
模块下移
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