1一内径d=100mm的空心圆轴如图示,已知圆轴受扭矩T=kN·m,许用切应力[r]=80MPa, 试确定空心圆轴的壁厚

2-1引言 §2-2 算子方程 §2-3 零输入响应 r (t) zi 的求法

1 . A reaction has the stoichiometric equationA+B=2R. What is the order of reaction? 2. A reaction with stoichiometric equationhas the following rate expressionWhat is the rate expression for this reaction if thestoichiometric equation is written as A+2B=2R+S?A B R S2

1 一半径为a的导体球, 被围在内半径为b、外半径为c，相对介电系数为r 的介质同心球壳内，若导体球带电荷量为Q， 求D(r)，E (r)和导体表面电势

1若电荷均匀分布在长为L的细棒上,求证: (1)在棒的延长线,且离棒中心为r处的电

Problem 1 Deal-Grove model states that the thickness of the oxide is related to a time constant r and two constants A and b by the relation

Consider a digraph G = (V, E) with edge-weight function w : E → R. The weight of path p = v1 → v2 → L → vk is defined to be

第二章多元函数 2-3习题讨论 23-1讨论题 23-2参考解答 习题讨论 题目 )设xn,yn∈R\,且 limx=x, lim y=y,证明 lim(,,,)=(,y) (2)函数f(x,y)=(,列在R\×R\中连续 (二)在长方体T内任取一点M0,是否一定存在一张过点M的平 面∏I,将该长方体恰分成两等份 (三)设集合A,BCR”,证明

10.曲面的面积 引理平面z1与x2的夹角为y,兀1上的区域4在r2上的投影为σ

二维离散r.v的条件分布律 设二维离散型r.v.(X,Y)的分布 若-XO 记作 则称y)) j12 9 为在X=x1的条件下,Y的条件分布律