Which statements， when inserted at the indicated position in the following code， will cause a runtime exception when attempting to run the program？（）   class A {}   class B extends A {}   class C extends A {}   public class Q3ae4 {   public static void m

题目

Which statements， when inserted at the indicated position in the following code， will cause a runtime exception when attempting to run the program？（）   class A {}   class B extends A {}   class C extends A {}   public class Q3ae4 {   public static void main（String args[]） {   A x = new A（）；   B y = new B（）；   C z = new C（）；   // insert statement here   }   } 

  • A、x = y；
  • B、z = x；
  • C、y = （B） x；
  • D、z = （C） y；
  • E、y = （A） y；
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更多“Which statements， whe”相关问题

  • 第1题：

    Which of the following statements is true regarding the VERSIONS BETWEEN clause？（）  

    • A、 The VERSIONS BETWEEN clause may be used in DML statements.
    • B、 The VERSIONS BETWEEN clause may be used in DDL statements.
    • C、 The VERSIONS BETWEEN clause may not be used to query past DDL changes to tables.
    • D、 The VERSIONS BETWEEN clause may not be used to query past DML statements to tables.

    正确答案:C

  • 第2题：

    在SQLServer数据库中，HAVING和WHERE子句以及GROUPBY可以在同一SELECT语句中使用，其正确的先后顺序为（）

    • A、GROUP BY WHERE HAVING
    • B、WHE REGROUP BY HAVING
    • C、WHE REHAVING GROUP BY
    • D、HAVING WHERE GROUP BY

    正确答案:B

  • 第3题：

    Which of these appropriately describes the results of a manual SQL Tuning Advisor task?（）

    • A、A list of SQL statements and recommendations for tuning
    • B、A list of SQL statements that have been tuned by the Advisor, with before and after metrics
    • C、Graphs showing the actual performance improvement made by the Advisor after it implemented the recommended changes
    • D、All of the above

    正确答案:A

  • 第4题：

    Which two statements are true about standard database auditing（）

    • A、DDL statements can be audited.
    • B、Statements that refer to stand-alone procedure can be audited.
    • C、Operations by the users logged on as SYSDBA cannot be audited.
    • D、Only one audit record is ever created for a session per audited statement even though it is executedmore than once.

    正确答案:A,B

  • 第5题：

    多选题
    If p and q are primes greater than 2, which of the following statements must be true? (Indicate all such statements.)
    A

    p + q is even

    B

    pq is odd

    C

    p2-q2 is even


    正确答案： A,B
    解析：
    由于所有大于2的质数都是奇数，因此p和q均是奇数，两奇数相加为偶数，所以A项正确；两奇数的乘积还是奇数，所以B项正确；两奇数的平方还各自是奇数，而两奇数的平方之差是偶数，因此C项也正确；所以选择A、B、C三项。

  • 第6题：

    多选题
    Which of the following statements are true? (Indicate all such statements.)
    A

    τ(5) =τ(7)

    B

    τ(5) τ(7) =τ(35)

    C

    τ(5) + τ(7) =τ(12)


    正确答案： A,B
    解析：
    5和7均只有两个正除数，因此根据题干信息，A项正确；35有四个正除数，所以B项也是正确的；12有6个正除数，因此C项错误；选择A、B两项。

  • 第7题：

    单选题
    Which statement is true when you run the SQL Tuning Advisor with limited scope？（）
    A

    Access path analysis is not performed for the SQL statements.

    B

    SQL structure analysis is not performed for the SQL statements.

    C

    SQL Profile recommendations are not generated for the SQL statements.

    D

    The staleness and absence of the statistics are not checked for the objects in the query supplied to the SQL Tuning Advisor.


    正确答案： B
    解析： 暂无解析

  • 第8题：

    多选题
    Which two statements are reserved words in Java？（）
    A

    Run

    B

    Import

    C

    Default

    D

    Implement


    正确答案： B,D
    解析： 暂无解析

  • 第9题：

    多选题
    Which are DML statements? （）
    A

    COMMIT

    B

    MERGE

    C

    UPDATE

    D

    DELETE

    E

    CREATE

    F

    DROP


    正确答案： E,C
    解析： 暂无解析

  • 第10题：

    单选题
    Which of the following statements is correct concerning the “flash point ” of a liquid?（）
    A

    It is lower than the ignition temperature

    B

    It is the temperature at which a substance will spontaneously ignite

    C

    It is the temperature at which a substance, when ignited, will continue to bum

    D

    It is the temperature at which the released vapors will fall within the explosive range


    正确答案： A
    解析： 暂无解析

  • 第11题：

    单选题
    Which is the source used by Automatic SQL Tuning that runs as part of the AUTOTASK framework？（）
    A

     SQL statements that are part of the AWR baseline only

    B

     SQL statements based on the AWR top SQL identification

    C

     SQL statements that are part of the available SQL Tuning Set （STS） only

    D

     SQL statements that are available in the cursor cache and executed by a user other than SYS


    正确答案： A
    解析： 暂无解析

  • 第12题：

    单选题
    Which of the following statements is true regarding the VERSIONS BETWEEN clause？（）
    A

     The VERSIONS BETWEEN clause may be used in DML statements.

    B

     The VERSIONS BETWEEN clause may be used in DDL statements.

    C

     The VERSIONS BETWEEN clause may not be used to query past DDL changes to tables.

    D

     The VERSIONS BETWEEN clause may not be used to query past DML statements to tables.


    正确答案： A
    解析： 暂无解析

  • 第13题：

    Which statement is true regarding the INTERSECT operator?（）

    • A、It ignores NULL values 
    • B、Reversing the order of the intersected tables alters the result 
    • C、The names of columns in all SELECT statements must be identical 
    • D、The number of columns and data types must be identical for all SELECT statements in the query 

    正确答案:D

  • 第14题：

    Which three statements are valid SDM configuration wizards？ （）

    • A、NAT
    • B、VPN
    • C、STP
    • D、Security Audit

    正确答案:A,B,D

  • 第15题：

    Which is the source used by Automatic SQL Tuning that runs as part of the AUTOTASK framework？（）

    • A、 SQL statements that are part of the AWR baseline only
    • B、 SQL statements based on the AWR top SQL identification
    • C、 SQL statements that are part of the available SQL Tuning Set （STS） only
    • D、 SQL statements that are available in the cursor cache and executed by a user other than SYS

    正确答案:B

  • 第16题：

    Which component does the SQL Tuning Advisor NOT analyze for the SQL statements？（）  

    • A、ADDM
    • B、AWR
    • C、Cursor Cache
    • D、SQL Tuning Sets
    • E、Flash Recovery Area

    正确答案:E

  • 第17题：

    多选题
    Concerning the figure below, if a =b, which of the following statements must be true? (Indicate all such statements.)
    A

    c=d

    B

    l and k are parallel

    C

    m and l are perpendicular


    正确答案： C,B
    解析：
    根据题目中的已知信息无法推断出各直线的关系，因此B、C均不正确；而由图示可知，c和d分别是a和b的补角，由于a=b，所以c=d，A项正确。

  • 第18题：

    多选题
    下列属于知识管理处理的内容是（）
    A

    Know-whA.t

    B

    Know-whE.n

    C

    Know-how

    D

    Know-who

    E

    Know-why


    正确答案： E,C
    解析： 暂无解析

  • 第19题：

    多选题
    Which are DML statements? （）
    A

    COMMIT

    B

    MERGE

    C

    UPDATE

    D

    DELETE

    E

    CREATE

    F

    DROP...


    正确答案： D,F
    解析： 暂无解析

  • 第20题：

    单选题
    Which of the following statements is NOT a way of consolidating vocabulary?
    A

    Defining.

    B

    Matching.

    C

    Gap-filling.

    D

    Labeling.


    正确答案： D
    解析：

  • 第21题：

    单选题
    For the following statements， which one is the strongest symmetrical encryption algorithm？（）
    A

    AES

    B

    3DES

    C

    DES

    D

    Diffie-Hellman


    正确答案： D
    解析： 暂无解析

  • 第22题：

    多选题
    Which three statements about subqueries are true? （）
    A

    Asinglerowsubquerycanretrieveonlyonecolumnandonerow.

    B

    Asinglerowsubquerycanretrieveonlyonerowbutmanycolumns.

    C

    Amultiplerowsubquerycanretrievemultiplerowsandmultiplecolumns.

    D

    Amultiplerowsubquerycanbecomparedusingthe；>；；operator.

    E

    AsinglerowsubquerycanusetheINoperator.

    F

    Amultiplerowsubquerycanusethe；=；operator.


    正确答案： D,A
    解析： 暂无解析

  • 第23题：

    单选题
    Which component does the SQL Tuning Advisor NOT analyze for the SQL statements？（）
    A

    ADDM

    B

    AWR

    C

    Cursor Cache

    D

    SQL Tuning Sets

    E

    Flash Recovery Area


    正确答案： A
    解析： 暂无解析

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