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【单选题】

In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low alloy steels because （）.

A、the beveled edges of the intake valves provide for serf-centering during seating

B、intake valves utilize stellite-coated valve seat inserts which reduce wear

C、the volume of air passing through intake valves is less than the volume of air passing through exhaust valves

D、intake valves are less affected to the corrosive action of exhaust gases

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更多“In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low alloy steels because （）.”相关的问题
第1题
[单选题] （）, so they are widely used on board ship nowadays.

A、Diesel engines have more advantages in comparison with gasoline engines  B、Diesel engines have more advantages in comparison to gasoline engines  C、Gasoline engines have more advantages in comparison with diesel engines  D、Gasoline engines have more advantages in comparison to diesel engines  

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第2题
[多选题] Which two statements about subqueries are true?（）

A、A single row subquery can retrieve data from only one table.  B、A SQL query statement cannot display data from table B that is referred to in its subquery, unless table B is included in the main query's FROM clause.  C、A SQL query statement can display data from table B that is referred to in its subquery, without including table B in its own FROM clause.  D、A single row subquery can retrieve data from more than one table.  E、A single row subquery cannot be used in a condition where the LIKE operator is used for comparison.  F、A multiple-row subquery cannot be used in a condition where the LIKE operator is used for comparison.  

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第3题
[多选题] Which two statements about subqueries are true?（）

A、A single row subquery can retrieve data from only one table.  B、A SQL query statement cannot display data from table B that is referred to in its subquery, unless table B is included in the main query's FROM clause.  C、A SQL query statement can display data from table B that is referred to in its subquery, without including table B in its own FROM clause.  D、A single row subquery can retrieve data from more than one table.  E、A single row subquery cannot be used in a condition where the LIKE operator is used for comparison.  F、A multiple-row subquery cannot be used in a condition where the LIKE operator is used for comparison.  

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

A、A single row subquery can retrieve data from only one table.  B、A SQL query statement cannot display data from table B that is referred to in its subquery, unless table B is included in the main query's FROM clause.  C、A SQL query statement can display data from table B that is referred to in its subquery, without including table B in its own FROM clause.  D、A single row subquery can retrieve data from more than one table.  E、A single row subquery cannot be used in a condition where the LIKE operator is used for comparison.  F、A multiple-row subquery cannot be used in a condition where the LIKE operator is used for comparison.  

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第5题
[] In comparison to electric power，hydraulic power for jacking systems has the advantage of（）.

A、A.better control capabilities  B、B.less maintenance and repair  C、C.fewer personnel needed during jacking  D、D.less preload needed  

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第6题
[单选题] Given the same water depth and line tension，the holding power of a 19 pound/foot wire rope mooring system in comparison to the holding power of a 90 pound/foot chain mooring system will be（）.

A、weaker  B、equal  C、greater  D、indeterminable  

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第7题
[多选题] Which two statements about subqueries are true? （）

A、A single row subquery can retrieve data from only one table.  B、A SQL query statement cannot display data from table B that is referred to in its subquery, unless table B is included in the main query's FROM clause.  C、A SQL query statement can display data from table B that is referred to in its subquery, without including B in its own FROM clause.  D、A single row subquery can retrieve data from more than one table.  E、A single row subquery cannot be used in a condition where the LIKE operator is used for comparison.  F、A multiple-row subquery cannot be used in an INSERT statement to insert multiple rows at a time.  

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

A、A. A single row subquery can retrieve data from only one table.  B、B. A SQL query statement cannot display data from table B that is referred to in its subquery, unless table B is included in the main query's FROM clause.  C、C. A SQL query statement can display data from table B that is referred to in its subquery, without including B in its own FROM clause.  D、D. A single row subquery can retrieve data from more than one table.  E、E. A single row subquery cannot be used in a condition where the LIKE operator is used for comparison.  F、F. A multiple-row subquery cannot be used in an INSERT statement to insert multiple rows at a time.  

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第9题
[单选题] A user is reporting that access to a file server is much slower than it has been. The system administrator completes a test of the server using a system monitoring tool and compares it to the previously taken baseline. The comparison shows that there are no significant changes in the use of system resources. Which of the following actions should be taken to resolve this user problem?（）

A、Add additional RAM to the user PC  B、Troubleshoot the user PC  C、Add additional RAM to the server  D、Add additional hard drive space to the server  

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第10题
[单选题] In the area of Performance Management and Diagnostics, which feature is supported in Oracle  Enterprise Manager 12C?（）

A、Search information in logs across multiple domains  B、View different log information in single console location  C、Save current performance data as baseline to be used in comparison with future data  D、Provides single dashboard across multi-tier composite application  

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