Definitions – Digital Signature - a data string which associates a message with some originating entity – Digital Signature Generation Algorithm – a method for producing a digital signature – Digital signature verification algorithm - a method for verifying that a digital signature is authentic (i.e., was indeed created by the specified entity)

一、选择题 A型题 1.a2.e3.d4.c5.d6.b7.8.d9.c10.e11.a 12.e13.a14.c15.b16.a17.d18.e19.d20.c21.c22.c 23.c24.b25.b26.c27.a2

A real, an imaginary, or a complex forcing function will produce a real, an imaginary, or complex response, respectively. Instead of applying a real forcing function to obtain the desired real response, we apply a complex forcing function whose real part is the given real forcing function; we obtain a complex response whose real part is the desired real response

Intensive Study There's a Lot More to Life than a Job Para.1 It has often been remarked that the saddest thing about youth is that it is wasted on the young. Para. 2 Reading a survey report on first-year college students, I recalled the regret, \If only knew then what know now

In this lecture, we consider the motion of a 3D rigid body. We shall see that in the general three dimensional case, the angular velocity of the body can change in magnitude as well as in direction, and, as a consequence, the motion is considerably more complicated than that in two dimensions. Rotation About a Fixed Point We consider first the simplified situation in which the 3D body moves in such a way that there is always a point, O, which is fixed. It is clear that, in this case, the path of any point in the rigid body which is at a

一、相似矩阵与相似变换的概念 定义1设A,B都是n阶矩阵若有可逆矩阵P,使 P-AP= B, 则称B是A的相似矩阵或说矩阵A与B相似对A进 行运算P-1AP称为对A进行相似变换可逆矩阵P 称为把A变成B的相似变换矩阵

Exercises 4(280) 1.Create a Text class that contains a string object to hold the text of a file. Give it two constructors: a default constructor and a constructor that takes a string argument that is the name of the file to open. When the second constructor is used, open the file and read the contents into the string

背诵篇章 01 The Language of Music A painter hangs his or her finished pictures on a wall, and everyone can see it. A composer writes a work, but no one can hear it until it is performed. Professional singers and players have great responsibilities, for the composer is utterly dependent on them. A student of music needs as long and as arduous a training to become

一、选择题 A型题 1.d2.d3.d4.e5.d6.7.b8.d9.c10.a11 12.d13.d14.c15.b16.e17.d18.C19.d20.c21.a22.c 23.b24.c25.a26.b27.e28.b29.c30.d31.a32.d33.d 34.d35.c36.c37.a38.d39.b40

引例: 1996年9月,上海L厂向澳洲R公司出口一批全棉浴巾, 但L厂本身并不具备外贸经营权,于是双方找到有外贸经营 权的上海A公司要求合作,约定由A公司代理出口该批货物 。11月初,澳洲R公司与上海A公司签订了进出口合同。合 同上写明:卖方为上海A公司,买方为澳洲R公司;装运期 为1996年11月;付款方式为船运后60天电汇,质量以R公 司代表在L厂验货为准。货到后,R公司认为,货物存在质 量问题,造成其经济上的损失,故拒不付款,并要求A公司 予以赔偿;A公司则认为质量问题与己无关,是由R公司代 表在L厂验货,应由L厂与R公司解决,坚持要求R公司依约 付款