多项选择题
A.The function method must have the signature： public String spin（）.
B.The method must be mapped to the logical name "spin" in the web.xml file.
C.The function method must have the signature： public String spinIt（）.
D.The function method must have the signature public static String spin（）.
E.The function method must have the signature： public static String spinIt（）.
F.The function class must be named Spinner， and must be in the package com.example.
单项选择题 Given a web application in which the cookie userName is expected to contain the name of the user. Which EL expression evaluates to that user name？（）
多项选择题 Given： http：//com.example/myServlet.jsp？num=one&num=two&num=three. Which two produce the output"one， two and three"？（）
多项选择题 Given： 11.<% java.util.Map map = new java.util.HashMap（）； 12.request.setAttribute（"map"， map）； 13.map.put（"a"， "true"）； 14.map.put（"b"， "false"）； 15.map.put（"c"， "42"）； %> Which three EL expressions are valid and evaluate to true？（）