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【单选题】

Which description regarding OSPF Network LSAs is correct?（）

A、They are originated by Area Border Router and are sent into a single area to advertise an Autonomous System Border Router.

B、They are originat ed by Area Border Routers and are sent into a single area to advertise destinations outside that area.

C、They are originated by the DR on every multi - access network. They include all attached routers including the DR itself.

D、They are originated by  every router in the OPSF network. They include all routers on the link, interfaces, the cost of the link, and any known neighbor on the link.

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第1题
[多选题] Which two statements are true regarding the role of the Routing Engine (RE)?（）

A、The RE controls and monitors the chassis.  B、The RE manages the Packet Forwarding Engine (PFE).  C、The RE receives a copy of the forwarding table from the forwarding plane.  D、The RE implements class of service (COS).  

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第2题
[单选题] You need to change the definition of an existing table. The COMMERCIALS table needs its DESCRIPTION column changed to hold varying length characters up to 2000 bytes. The column can currently hold 1000 bytes per value. The table contains 20000 rows.Which statement is valid?（）

A、ALTER TABLE commercials MODIFY (description CHAR2(2000));  B、ALTER TABLE commercials CHANGE (description CHAR2(2000));  C、ALTER TABLE commercials CHANGE (description VARCHAR2 (2000));  D、ALTER TABLE commercials MODIFY (description VARCHAR2 (2000));  E、You cannot increase the size of a column if the table has rows.  

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第3题
[单选题] You need to change the definition of an existing table. The COMMERCIALS table needs its DESCRIPTION column changed to hold varying length characters up to 2000 bytes. The column can currently hold 1000 bytes per value. The table contains 20000 rows. Which statement is valid?（）

A、ALTER TABLE commercials MODIFY (description CHAR2(2000));  B、ALTER TABLE commercials CHANGE (description CHAR2(2000));  C、ALTER TABLE commercials CHANGE (description VARCHAR2(2000));  D、ALTER TABLE commercials MODIFY (description VARCHAR2(2000));  E、You cannot increase the size of a column if the table has rows.  

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第4题
[单选题] You need to change the definition of an existing table. The COMMERCIALS table needs its DESCRIPTION column changed to hold varying length characters up to 2000 bytes. The column can currently hold 1000 bytes per value. The table contains 20000 rows. Which statement is valid?（）

A、ALTER TABLE commercials MODIFY (description CHAR2(2000));  B、ALTER TABLE commercials CHANGE (description CHAR2(2000));  C、ALTER TABLE commercials CHANGE (description VARCHAR2 (2000));  D、ALTER TABLE commercials MODIFY (description VARCHAR2 (2000));  E、You cannot increase the size of a column if the table has rows.  

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第5题
[] You need to change the definition of an existing table. The COMMERCIALS table needs its DESCRIPTION column changed to hold varying length characters up to 1000 bytes. The column can currently hold 500 bytes per value. The table contains 20000 rows. Which statement is valid?（）

A、A.ALTER TABLE commercials MODIFY (description CHAR2(1000));  B、B.ALTER TABLE commercials CHANGE (description CHAR2(1000));  C、C.ALTER TABLE commercials CHANGE (description VARCHAR2(1000));  D、D.ALTER TABLE commercials MODIFY (description VARCHAR2(1000));  E、E.You cannot increase the size of a column if the table has rows.  

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第6题
[] 比率分析应当选择的操作菜单是（）

A、A.Analyze→Descriptive Statistics→Frequencies  B、B.Analyze→Descriptive Statistics→Descriptives  C、C.Analyze→Descriptive Statistics→Crosstabs  D、D.Analyze→Descriptive Statistics→Ratio  

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第7题
[] 交叉分组下频数分析应选择的菜单是（）

A、A.Analyze→Descriptive Statistics→Frequencies  B、B.Analyze→Descriptive Statistics→Descriptives  C、C.Analyze→Descriptive Statistics→Crosstabs  D、D.Analyze→Descriptive Statistics→Ratio  

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第8题
[] 一般输液管路，如（）即认为是层流；而（）时则认为是紊流。

A、A.Re≤1000；Re≥1000  B、B.Re≤2000；Re≥2000  C、C.Re≤3000；Re≥3000  D、D.Re≤4000；Re≥4000  

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第9题
[单选题] 网页的META标签是指（）

A、title、h1、keywords  B、description、alt、keywords  C、robots、keywords、description  D、keywords、description、h2  

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第10题
[填空题] Grammar is a description of the（）of a language and the way in which linguistic units such as words and phrases are combined to produce sentences in the language.

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