维生素(vitamins)是动物维持正常功能所必需的一组有机化合物需要量极小但动物 本身不能合成或合成量不足,必须从食物中获得,是人体必需的一类微量营养素。目前 已知为人体所必需的维生素有13种,根据溶解度不同分脂溶性和水溶性两类。脂溶性 维生素有维生素A、维生素D、维生素E、维生素K水溶性维生素有硫胺素(B1) 核黄素(B2)、尼克酸(B3)、遍多酸(B5)、生物素、叶酸(M)钴胺素(B12)和维 生素C

Market orders are to be executed as soon as possible after reaching the exchange floor. Limit orders must specify a price and a time limit, e.g. \Buy 500 at $90, good till canceled.\ A stop order differs from a limit order in that the order is only executed if the specified price, called the stop price, is touched. Stop orders become market orders when the stop price is reached

Bond Principles: Identification- of Bonds Bonds are identified by issuer, coupon rate, and maturity. The face value of a bond is called its par value. e.g. 5 of \Hertz sevens of 03\(Hertz 7s03) .A legal document called the indenture contains the details of the bond issue

(一)基本概念 1、体系与环境(System and surrounding): 体系:研究的对象;环境:与体系相关,影响所能及的部分 有无m,E交换:①开放; ②封闭; ③孤立(隔离)

一、Boh静电荷模型(p132“Boh理论”) 二、e圆周运动

一、了解PROE系统的有关知识 二、掌握PRO/E二维草绘的意义与方法 三、二维图形的绘制步骤与技巧

3.1 X(eo)=2xnJe-jon where x[n] is a real sequence. Therefore X(e)=Rl∑xnlo/。 ∑xR(-mu)=∑ x[n]cos(on),and xmm)=m∑刈nm∑刈mc-m)=-2 xn] sin(oon) Since cos(on)and sin(on)are, respectively, even and odd functions of o, Xre(eJo) is an even function of o

SAMPLING We live in a continuous-time world most of the signals we encounter are CT signals, e.g. x(). How do we convert them into Dt signals x[n? Sampling, taking snap shots of x(t) every Seconds

Motivation for the Laplace transform CT Fourier transform enables us to do a lot of things, e. g Analyze frequency response of lTi systems Sampling Modulation Why do we need yet another transform? One view of Laplace Transform is as an extension of the Fourier

Home Study Exercise (E1)O&W3.46(a)and(c) (t) and y(t) are continuous-time periodic signals with a period= To and Fourier series representations given b