Time: Duration of the speech should be 15 seconds around the required time. Failure to meet the requirement will result in the deduction of points.
时间要求:演讲时间必须控制在规定时间上下15秒之间,否则酌情扣分。
Mathematical deduction is one of key and different points in middle school mathematics teaching.
数学归纳法是中学数学教学内容中的重点与难点之一。
In this paper, the rules governing it are considered as a total and at each point the probability of defective arrangement of points on the chart is evaluated by strict mathematical deduction.
本文把它的所有判断规则看作一个整体,并用严格的数学推导计算了在每一点上点子排列有缺陷的概率。
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