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【单选题】

（） can be operated independently or locked together and operated as a twin-job cranes of double capacity.

A、Two derricks

B、A derrick and a crane

C、Two cranes

D、A crane and a winch

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更多“（） can be operated independently or locked together and operated as a twin-job cranes of double capacity.”相关的问题
第1题
[] Which of the following statements is TRUE regarding crane operations（）.

A、A.Radio communications allow the crane operator to disregard the use of hand signals  B、B.The crane operators and signalman must be familiar with the correct hand signals  C、C.The forward cranes can be operated from the bridge  D、D.The aft cranes can be operated from the aft steering station  

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第2题
[单选题] A common rail engine has only one or two high pressure pumps in operation at the same（）time, and the injection into each cylinder.

A、can’t be controlled very precisely  B、can’t be controlled as flexibly as the separate pump system  C、can be controlled as flexibly as the separate pump system  D、can be controlled more precisely and flexibly  

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第3题
[单选题] If there is any doubt as to the proper operation of a radar，which statement is TRUE?（）.

A、Only a radar expert can determine if the radar is operating  B、All radars have indicator lights and alarms to signal improper operation  C、A radar range compared to the actual range of a known object can be used to check the operation of the radar  D、The radar resolution detector must be energized to check the radar  

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第4题
[多选题] Which three statements about subqueries are true? （）

A、A single row subquery can retrieve only one column and one row.  B、A single row subquery can retrieve only one row but many columns.  C、A multiple row subquery can retrieve multiple rows and multiple columns.  D、A multiple row subquery can be compared using the ">" operator.  E、A single row subquery can use the IN operator.  F、A multiple row subquery can use the "=" operator.  

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第5题
[多选题] Which three statements about subqueries are true?（）

A、A single row subquery can retrieve only one column and one row.  B、A single row subquery can retrieve only one row but many columns.  C、A multiple row subquery can retrieve multiple rows and multiple columns.  D、A multiple row subquery can be compared by using the ">" operator.  E、A single row subquery can use the IN operator.  F、A multiple row subquery can use the "=" operator.  

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第6题
[单选题] Which change can you make to Target without affecting Client？（）

A、Line 4 of class Target can be changed to return i++；  B、Line 2 of class Target can be changed to private int i = 1；  C、Line 3 of class Target can be changed to private int addOne（）{}；  D、Line 2 of class Target can be changed to private Integer i = 0；  

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第7题
[单选题] Given： Which change can you make to Target without affecting Client？（）

A、Line 4 of class Target can be changed to return i++；  B、Line 2 of class Target can be changed to private int i = 1；  C、Line 3 of class Target can be changed to private int addOne（）{  D、Line 2 of class Target can be changed to private Integer i = 0；  

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第8题
[] Which three statements about subqueries are true?（）

A、A. A single row subquery can retrieve only one column and one row.  B、B. A single row subquery can retrieve only one row but many columns.  C、C. A multiple row subquery can retrieve multiple rows and multiple columns.  D、D. A multiple row subquery can be compared by using the ">" operator.  E、E. A single row subquery can use the IN operator.  F、F. A multiple row subquery can use the "=" operator.  

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第9题
[] Which three statements about subqueries are true?（）

A、A. A single row subquery can retrieve only one column and one row.  B、B. A single row subquery can retrieve only one row but many columns.  C、C. A multiple row subquery can retrieve multiple rows and multiple columns.  D、D. A multiple row subquery can be compared by using the “>” operator.  E、E. A single row subquery can use the IN operator.  F、F. A multiple row subquery can use the “=” operator.  

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第10题
[多选题] Which three tasks can be performed using regular expression support in Oracle Database 10g？（）

A、 it can be used to concatenate two strings.  B、 it can be used to find out the total length of the string.  C、 it can be used for string manipulation and searching operations.  D、 it can be used to format the output for a column or expression having string data.  E、 it can be used to find and replace operations for a column or expression having string data.  

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