【简答题】设系统由下面差分方程描述: y ( n )= y ( n - 1)+ y ( n - 2)+ x ( n - 1) ( 1 ) 求系统的系统函数 H ( z ) , 并画出极零点分布图; ( 2 ) 限定系统是因果的, 写出 H ( z ) 的收敛域, 并求出其单位脉冲响应 h ( n ) ; ( 3 ) 限定系统是稳定性的, 写出 H ( z ) 的收敛域, 并求出其单位脉冲响应 h ( n ...
【多选题】Task 5 A web tester is introducing a series of statements about the Web Accessibility Initiative (WAI) website. Check out whether the following statements are consistent with what you hear. If not, co...
A.
1. The homepage is attractive.
B.
2. The homepage makes me want to explore the site further.
C.
3. The fonts used throughout the site are attractive.
D.
4. I can get information easily.
E.
5. It is funny to explore the site and quickly to remember where to find things.
【简答题】A web tester is introducing a series of statements about the Web Accessibility Initiative (WAI) website. Check out whether the following statements are consistent with what you hear. If not, correct t...