Windows XP mode on a Windows 7 Professional machine fails to load. Which of the following isMOST likely the cause?（）
A、The machine does not have enough processor cores to allow for this feature.
B、Virtualization support is not enabled in the BIOS.
C、A license of Windows XP must be purchased in order to use Windows XP Mode.
D、The machine does not have enough RAM to allow for this feature.
In which case would you use a FULL OUTER JOIN?（）
A、Both tables have NULL values.
B、You want all unmatched data from one table.
C、You want all matched data from both tables.
D、You want all unmatched data from both tables.
E、One of the tables has more data than the other.
F、You want all matched and unmatched data from only one table.
创建一个名为student的新类，保存新类的类库名称是mylib，新类的父类是Person，正确的命令是（ ）。
A、CREATE CLASS mylib OF student As Person
B、CREATE CLASS student OF Person As mylib
C、CREATE CLASS student OF mylib As Person
D、CREATE CLASS Person OF mylib As student
下列关于软件测试的目的和准则的叙述中，正确的是（ ）。
A、软件测试是证明软件没有错误
B、主要目的是发现程序中的错误
C、主要目的是确定程序中错误的位置
D、测试最好由程序员自己来检查自己的程序
在表单中为表格控件指定数据源的属性是（ ）。
A、DataSource
B、RecordSource
C、DataFrom
D、RecordFrom
AutoCAD中，对象的阵列有哪几种方式（）。
A、环形
B、圆形
C、线形
D、矩形