15-1约束虚位移虚功 15-2虚位移原理

人教版高中历史必修2第五单元第15课 交通和通讯工具的进步教案(2)

Gonorrhoea What is gonorrhoea? Gonorrhoea is a yenereal disease caused by the bacteria Neisseria gonorrhoeae. The disease most frequently 15-25 affects 15-25-year-olds, although the number of cases has fallen in recent years. How do you contract gonorrhoea? Gonorrhoea is mainly transmitted through sexual contact. However, mothers infected with gonorrhoea can also

15-16如图15-16所示,两相干波源分别在P、Q两点处,它们发出频 率为v、波长为,初相相同的两列相干波设PQ=312,R为PQ连线上的一 点求:(1)自P、Q发出的两列波在R处的相位差;(2)两波在R处涉时的合 振幅

一、写出下列化合物的名称或结构式(每题15分,共15分)

一、选择题(在四个答案中选择一个正确的,将正确答案填入题后括号内) (本大题分15小题,每小题1分,共15分) 1、牛奶、啤酒、果酒和酱酒的消毒一般采用 A.巴氏消毒法 B间歇灭菌法 C.常规加压法; D连续加压灭菌法。 答:()

I Consider the graph shown in Fig. 15-15. Denote the tree made up of b 6, bs, and b, by t (a)Find all the fundamental loops of this graph corresponding to T (b) Find all the fundamental cutsets of this graph corresponding to t (c) Write the incidence matrix of this graph choose n 4 as the datum

15-6 The partial-fraction-expansion method

15-5 Several basis theorems for the Laplace transform 1.The linearity theorem{fi(t)+()}=()+(s) Example:

15-4 Laplace transform of some simple time function 1. The unit step function