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【单项选择题】

The （） returns the pump operating rod to mid position as soon as the helmsman stops turning the wheel.

A、A.hunting gear

B、B.cut-off level

C、C.servo-motor

D、D.swivel block

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更多“The （） returns the pump operating rod to mid position as soon as the helmsman stops turning the wheel.”相关的问题
第1题
[单选题] Examine the description of the MARKS table: SUBJ1 and SUBJ2 indicate the marks obtained by a student in two subjects. Examine this SELECT statement based on the MARKS table: What is the result of the SELECT statement?（）

A、The statement executes successfully and returns the student ID and sum of all marks for each student who obtained more than the average mark in each subject.  B、The statement returns an error at the SELECT clause.  C、The statement returns an error at the WHERE clause.  D、The statement returns an error at the ORDER BY clause.  

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第2题
[单选题] What is true regarding subqueries?（）

A、The inner query always sorts the results of the outer query.  B、The outer query always sorts the results of the inner query.  C、The outer query must return a value to the inner query.  D、The inner query returns a value to the outer query.  E、The inner query must always return a value or the outer query will give an error.  

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第3题
[单选题] What is true regarding subqueries?（）

A、The inner query always sorts the results of the outer query  B、The outer query always sorts the results of the inner query  C、The outer query must return a value to the outer query  D、The inner query returns a value to the outer query  E、The inner query must always return a value or the outer query will give an error  

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第4题
[] What is true regarding subqueries?（）

A、A. The inner query always sorts the results of the outer query  B、B. The outer query always sorts the results of the inner query  C、C. The outer query must return a value to the outer query  D、D. The inner query returns a value to the outer query  E、E. The inner query must always return a value or the outer query will give an error  

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第5题
[单选题] You define a multiple-row subquery in the WHERE clause of an SQL query with a comparison operator "=".What happens when the main query is executed?（）

A、The main query executes with the first value returned by the subquery.  B、The main query executes with the last value returned by the subquery.  C、The main query executes with all the values returned by the subquery.  D、The main query fails because the multiple-row subquery cannot be used with the comparison operator.  E、You cannot define a multiple-row subquery in the WHERE clause of a SQL query.  

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第6题
[单选题] You define a multiple-row subquery in the WHERE clause of an SQL query with a comparison operator "=".What happens when the main query is executed?（）

A、The main query executes with the first value returned by the subquery.  B、The main query executes with the last value returned by the subquery.  C、The main query executes with all the values returned by the subquery.  D、The main query fails because the multiple-row subquery cannot be used with the comparison operator.  E、You cannot define a multiple-row subquery in the WHERE clause of a SQL query.  

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第7题
[单选题] You define a multiple-row subquery in the WHERE clause of an SQL query with a comparison operator "=". What happens when the main query is executed? （）

A、The main query executes with the first value returned by the subquery.  B、The main query executes with the last value returned by the subquery.  C、The main query executes with all the values returned by the subquery.  D、The main query fails because the multiple-row subquery cannot be used with the comparison operator.  E、You cannot define a multiple-row subquery in the WHERE clause of a SQL query.  

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第8题
[多选题] Which two statements are true regarding the execution of the correlated subqueries？（）

A、 The nested query executes after the outer query returns the row.  B、 The nested query executes first and then the outer query executes.  C、 The outer query executes only once for the result returned by the inner query.  D、 Each row returned by the outer query is evaluated for the results returned by the inner query.  

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第9题
[单选题] You find this query being used in your Oracle 12c database: Which method a used by the optimizer to limit the rows being returned?（）

A、A filter is added to the table query dynamically using ROWNUM to limit the rows to 20 percent of the total rows  B、All the rows are returned to the client or middle tier but only the first 20 percent are returned to the screen or the application.  C、A view is created during execution and a filter on the view limits the rows to 20 percent of the total rows.  D、A TOP-N query is created to limit the rows to 20 percent of the total rows  

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第10题
[单选题] Examine the description of the MARKS table: STD_ID NUMBER(4) STUDENT_NAME VARCHAR2(30) SUBJ1 NUMBER(3) SUBJ2 NUMBER(3) SUBJ1 and SUBJ2 indicate the marks obtained by a student in two subjects. Examine this SELECT statement based on the MARKS table: SELECT subj1+subj2 total_marks, std_id FROM marks WHERE subj1 > AVG(subj1) AND subj2 > AVG(subj2) ORDER BY total_ marks; What is the result of the SELECT statement? （）

A、The statement executes successfully and returns the student ID and sum of all marks for each student who obtained more than the average mark in each subject.  B、The statement returns an error at the SELECT clause.  C、The statement returns an error at the WHERE clause.  D、The statement returns an error at the ORDER BY clause.  

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