使用InternetExplorer浏览网页时,随着鼠标的移动,当鼠标指针画过页面上的某些内容时,指针会变成()的形状。
A、箭头
B、手
C、问号
D、十字
下列主要应用于智能型手机、平板计算机、GPS车用导航计算机的操作系统是()。
AAndroid
BWindows 7
CWindows XP
DWindows Mobile
下面()属于版面的构成属素。
A、注文
B、边框
C、书眉和页码
D、版心
Which two operations can be performed on an external table()
ACreate a view on the table.
BCreate an index on the table.
CCreate a synonym on the table.
DAdd a virtual column to the table.
EUpdate the table using the UPDATE statement.
FDelete rows in the table using the DELETE command.
下列的URL中,具有身份验证与加密通讯的网站地址是()。
A、http://wenku.baidu.com
B、http://weibo.com
C、http://www.sina.com.cn
D、https://www.linkedin.com
E、http://www.youku.com
Examine the command that is used to create a table: SQL> CREATE TABLE orders(oid NUMBER(6) PRIMARY KEY, odate DATE, ccode NUMBER(6), oamt NUMBER(10,2)) TABLESPACE users; Which two statements are true about the effect of the above command) ()
AA CHECK constraint is created on the OID column.
BA NOT NULL constraint is created on the OID column.
CThe ORDERS table is the only object created in the USERS tablespace.
DThe ORDERS table and a unique index are created in the USERS tablespace.
EThe ORDERS table is created in the USERS tablespace and a unique index is created on the OIDcolumn in the SYSTEM tablespace.