【单选题】关于下列 代码{empty param.user?"Administrator":param.user}说法正确的是( )
B.
如果参数user为空则返回Administrator否则就返回user的值
C.
如果参数user为空字符则返回Administrator否则就返回user的值
D.
如果参数user为空则返回user否则就返回Administrator的值
【单选题】关于下列代码 xmlns="http://www.dlut.edu.cn/xml”> XML技术及应用 唐琳 34 说法不正确的是()。
B.
" XML技术及应用 "中的name在默认命名空间中
【单选题】Which form of logic gate system is given by a ladder diagram with a rung having two normally open gates in series?
【单选题】已知有如下代码: import java.util.*; public class Test{ public static void main(String... args){ List list=new LinkedList(); list.offer("hello"); list.offer("welcome"); System.out.println(list); } } 关于下列代码说法正...
A.
编译失败,因为list是一个列表不是队列,无法调用offer方法
B.
编译成功,运行成功,因为list.offer("hello");根据多态性,绑定为LinkedList对象的offer方法
C.
编译成功,运行失败,根据动态性,list无法调用LinkedList的offer方法
【单选题】The circuit shown will have identical logic out if all gates are changed to
【单选题】All Boolean expressions can be implemented with ( )
C.
combinations of NAND and NOR gates
D.
combinations of AND gates, OR gates, and inverters
【单选题】Which form of logic gate system is given by a ladder diagram with a rung having two normally closed gates in series?