简述配置文件中，Filter的[filter-mapping]元素的作用。

Filter的[filter-mapping]元素的子元素不包括[dispatcher]元素。

当我们编写好Filter或Servlet时在配置其mapping时，下面正确的是（多选）： A: 只能通过“url-pattern”来定义mapping B: 可通过“url-pattern”来定义mapping C: 只能通过“servlet-name”来定义mapping D: 可通过“servlet-name”来定义mapping

请阅读下面的程序，分析写出该Filter可以拦截的URL(至少写出两个答案)。 &#91;filter&#93; &#91;filter-name&#93;security&#91;/-name&#93; &#91;filter-class&#93;myFilters.SecurityFilter&#91;/-class&#93; &#91;/&#93; &#91;filter-mapping&#93;[br][/br] &#91;filter-name&#93;security&#91;/-name&#93; &#91;url-pattern&#93;/admin/*&#91;/-pattern&#93; </filter-mapping

表达式list(filter(lambda x:x.isupper(),&#91;‘a’,’B’,’aB’&#93;))的值为（______ ）。

Mind mapping

def is_odd(n):return n%2 == 1lst1 = filter(is_odd,&#91;1,2,3,4,5,6,7,8,9,10&#93;)list(lst1)值为？

可以被该Filter拦截的URL有( )。 &#91;filter&#93; &#91;filter-name&#93;security&#91;/-name&#93; &#91;filter-class&#93;myFilters.SecurityFilter&#91;/-class&#93; &#91;/&#93; &#91;filter-mapping&#93;[br][/br] &#91;filter-name&#93;security&#91;/-name&#93; &#91;url-pattern&#93;/news/*&#91;/-pattern&#93; </filter-mapping A: http://localhost:8080/test/news/Servlet1 B: http://localhost:8080/test/news/LoginServlet C: http://localhost:8080/test/news.jsp D: http://localhost:8080/test/news/admin/AddServlet

已知 f=lambda a:a>0, lst=&#91;-1,0,1&#93;，则表达式 list( filter(f,lst) ) 的结果为

What kind of filter is used to extract a single-freq. harmonic from the harmonic components contained in square wave? A: Low-pass Filter B: High-pass Filter C: Band-pass Filter D: Band-elimination Filter