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【单选题】

Monsoons are characterized by().

A、light,variable winds with little or no humidity

B、strong,gusty winds that blow from the same general direction all year

C、steady winds that reverse direction semiannually

D、strong,cyclonic winds that change direction to conform to the passage of an extreme low pressure system

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第2题

A、Syntax when writing queries involving JOINS  B、Memory usage when working with the data  C、Character set mapping index hash size  D、Disk usage when storing data  

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第3题

A、Enables easier loading of multinational data.   B、Uses a fixed-width Multibyte encoding sequence.  C、Asian characters are represented in three characters.   D、Used a variable-width Multibyte encoding sequence.   E、European characters are represented on one or two bytes.   

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第4题

A、The client and server have different NLS_LANGUAGE settings.  B、The client and server character sets are not the same, and the database character set is not a strict superset of the client character set.  C、The client and server are in different time zones.  D、The client requests automatic data conversion.  E、The AUTO_CONVERT initialization parameter is set to TRUE.  

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第5题

A、INSTR returns the numeric position of a named character.  B、NVL2 returns the first non-null expression in the expression list.  C、TRUNCATE rounds the column, expression, or value to n decimal places.  D、DECODE translates an expression after comparing it to each search value.  E、TRIM trims the heading or trailing characters (or both) from a character string.  F、NVL compares two expressions and returns null if they are equal, or the first expression if they are not equal.  H、NULLIF compares two expressions and returns null if they are equal, or the first expression if they are not equal.  

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第6题

A、INSTR returns the numeric position of a named character.  B、NVL2 returns the first non-null expression in the expression list.  C、TRUNCATE rounds the column, expression, or value to n decimal places.  D、DECODE translates an expression after comparing it to each search value.  E、TRIM trims the heading of trailing characters (or both) from a character string.  F、NVL compares two expressions and returns null if they are equal, or the first expression of they are not equal.  H、NULLIF compares twp expressions and returns null if they are equal, or the first expression if they are not equal.  

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第7题

A、INSTR returns the numeric position of a named character.  B、NVL2 returns the first non-null expression in the expression list.  C、TRUNCATE rounds the column, expression, or value to n decimal places.  D、DECODE translates an expression after comparing it to each search value.  E、TRIM trims the heading of trailing characters (or both) from a character string.  F、NVL compares two expressions and returns null if they are equal, or the first expression of they are not equal.  H、NULLIF compares twp expressions and returns null if they are equal, or the first expression if they are not equal.  

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第8题

A、INSTR returns the numeric position of a named character.  B、NVL2 returns the first non-null expression in the expression list.  C、TRUNCATE rounds the column, expression, or value to n decimal places.  D、DECODE translates an expression after comparing it to each search value.  E、TRIM trims the heading of trailing characters (or both) from a character string.  F、NVL compares two expressions and returns null if they are equal, or the first expression of they are not equal.  H、NULLIF compares twp expressions and returns null if they are equal, or the first expression if they are not equal.  

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