A client is having trouble connecting to the Internet. The client is using a static IP address and is able to connect to other devices on the network via IP address only. Which of the following is MOST likely the problem?（）

A、IMAP

B、DHCP

C、DNS

D、NAT

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） （）

A CHECK constraint is created on the OID column.

A NOT NULL constraint is created on the OID column.

The ORDERS table is the only object created in the USERS tablespace.

The ORDERS table and a unique index are created in the USERS tablespace.

The ORDERS table is created in the USERS tablespace and a unique index is created on the OIDcolumn in the SYSTEM tablespace.

Which two operations can be performed on an external table（）

Create a view on the table.

Create an index on the table.

Create a synonym on the table.

Add a virtual column to the table.

Update the table using the UPDATE statement.

Delete rows in the table using the DELETE command.

在PowerPoint2003中，对文字设置动画时，以下叙述正确的是（）。

A、按字引入文本，对西文是逐个单词出现，对中文是逐字出现

B、整批发送即幻灯片内的文字内容一起出现

C、按字母引入文本，对汉字而言是逐字出现

D、按照第一层段落分组，表示以最低层段落为动画单位

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

You have two tables with referential integrity enforced between them. You need to insert data to  thechild table first because it is going to be a long transaction and data for the parent table will be available ina later stage， which can be inserted as part of the same transaction. View the Exhibit to examine the commands used to create tables. Which action would you take to delay the referential integrity checking until the end of the transaction（）

A、 Set the constraint to deferred before starting the transaction.

B、 Alter the constraint to NOVALIDATE state before starting the transaction.

C、 Enable the resumable mode for the session before starting the transaction.

D、 Set the COMMIT_WAIT parameter to FORCE_WAIT for the session before starting the transaction.