在教学过程中,笔者发现绳端速度关联类问题对学生是一个难点。解决此类问题主要有三种解法:应用合运动与分运动的关系,应用微元法,应用能量转化及守恒定律。本文选取应... 周凯 - 《湖南中学物理》 被引量: 0发表: 2014年 全基因组关联研究中的模型构建与优化算法研究 遗传学家的主要任务为找到那些与疾病相关的易...
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,据此计算H(0)+H(1)+H(2)+H(3)+…+H(2015)的结果为()A.-1007B.-1008C.-1009D.-2010答案 B. H(0)+H(1)+H(2)+H(3)+…+H(2015) =1+(-2)+3+(-4)+…+2015+(-2016) =[1+(-2)]+[3+(-4)]+…+[2015+(-2016)] =-1+(-1)+…+(-1) =-1...
The blades (1A to D) of the submerged mixer rotor are symmetrical about a horizontal plane and consist of two flat plates (P and P') at 90 deg to each other. The rotor fits inside a cylindrical stator with vertical slots in its walls, through which fluid is pushed. The rotor and sta...