定义:变压器在U1N、f下,副边空载电压U20与负载 后在某一功率因数下副边端电压U2之差,与副边额定 电压U2N的比值

一、填空题(本大题共6小题,每小题4分,总计24分) 1.i2= 2.w=z+4将平面上|<2变为w平面上的 学号: 3.f()=zRe(z)在何处解析 4. f() =e-4 cos6t L[ f()]= 5.()=2(o)则f(t) 6.f()=u+iv为解析函数,u-v=x3+3x2y-3xy2-y3为解析函数,则u=

第一单元U检验 一、学习目标 通过本课的学习,掌握小概率事件原理,同时熟练掌握单正态总体均值的检 验(U检验)方法 二、内容讲解 1.小概率事件 假设检验是与点估计、区间估计有区别的另一类问题. 点估计面临的问题是:总体里含有未知参数解决的方法是根据样本求出一个 量去代替未知参数;区间估计面临的问题也是总体里含有未知参数,解决的方法是 确定一个区间以一定的概率去包含未知参数;而假设检验面临的问题更加广泛

8.4多元复合函数的求导法则 设z=f(u,v),而u=(t),v=y(t),如何求? 设z=f(v),而u=(,y)v=y(,y),如何求和

一、概念题(20分) 1、试写出n摩尔范德华气体的状态方程 2、水的正常冰点与水的三相点温度相差K。 3、根据状态函数的基本假定,对一定量的均相纯物质系统,其U,S,T三个状态函数间的关系为U=(S,T)或S=S(U,T)或T=T(,S)

Fixed -universe successor problem Goal: maintain a dynamic subset s of size n of the universe 0=10, 1,.,u-1 of size u subject to these operations INSERT(X∈U\\S): Add x to s DELETE(X E S): Remove x from S

1.解 1-1说明图(a),(b)中,(1)u,i的参考方向是否关联?(2)乘积表示 什么功率?(3)如果在图(a)中u>0,i0,i>0,元件实际发 出还是吸收功率?

Social welfare function W: Rn-R gives social utility W(u1, u2,. un ). W is strictly increasing is socially optimal if it solves max Wu(a1), u2(a2),., un(n) st>Tis>w Proposition 1.29. If is SO, it is PO. I Proposition 1. 30. Suppose that preferences are continuous, strictly monotonic, and strictly convex. Then, for any PO allocation x* with >>0,v i, there exist ai

Assumptions of the classical Linear Model (Clm) e So far, we know that given the Gauss Markov assumptions, OLS IS BLUE e In order to do classical hypothesis testing we need to add another assumption(beyond the Gauss-Markov assumptions) Assume that u is independent of x,x2…,xk and u is normally distributed with zero mean and variance 0: u- Normal(0, 02) Economics 20- Prof anderson

(1)i(p, u) is zero homogeneous in p (2) substitution matrix: Dpi(p, u)<0 (3)symmetric cross-price effects: 23i(p 2=2z(p, u) (4) decreasing:=n≤0