异面直线距离的求法

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空间想象力是人们对客观事物的空间几何形体进行观察、分析、认知的抽象思维能力,培养学生的空间想象力是中学数学教学的主要任务之一,同时也是难点之一。求异面直线距离是立体几何中的一个难点,对学生的空间想象能力要求较高,本文以一道题为例,从多角度讨论求异面直线距离的问题。1试题呈现已知正方体ABCD-A′B′C′D′的棱长为1,求直 Space imagination is one of the main tasks for secondary school mathematics teaching. It is also one of the difficulties for people to abstract the thinking ability of observation, analysis and cognition of the space geometry of objective things. Seeking different surface linear distance is one of the difficulties in the three-dimensional geometry, which has a high demand on the students’ spatial imagination ability. This article takes a question as an example to discuss the problem of finding the straight line distance of different surfaces from multiple perspectives. 1 questions presented known cube ABCD-A’B’C’D ’edge length of 1, seeking straight
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据Kline公司预测,到2020年底全球润滑剂需求增速不大于1%/a,半合成润滑剂增速低于1.5%/a,但合成润滑剂需求增速会接近4%/a。润滑剂行业至今对合成润滑油尚没有明确的定义,眼下Ⅲ类基础油