计算机英语试题 一、词汇(选择一个最合适的词汇,将对应的英文字母填入空格内。每题2分,共20分) 1, A is used to communicate with another computer over telephone lines. A. keyboard B. modem C. mouse D. printer
1 Find F(s) if f(t) = (a)(t-3);(b)4t u(t-3); (c)4 cos to(t-3). 2 Obtain partial-fraction expansions for each of the following rational functions, and find the corresponding time functions: