单项选择题
A. Command
B. Transfer object
C. Service locator
D. Session Façade
E. Business delegate
F. Data access object
多项选择题 Whichthe twoarecharacteristicsoftheServiceLocatorpattern？（）
单项选择题 Assumethetaghandlerforast：simpletagextendsSimpleTagSupport.Inwhatwaycanscriptletcodebeusedinthebodyofst：simple？（）
单项选择题 The tag handler for n：recurse extends SimpleTagSupport.Assuming an n：recurse tag can either contain an empty body or another n：recurse tag， which strategy allows the tag handler for n：recurse to output the nesting depth of the deepest n：recurse tag？（）