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自动消毒剂有红、黄、白三根管子,红色管子以每秒5克的流量流出浓度为20%的酒精溶液,黄色管子以每秒

4克的流量流出浓度为25%的酒精溶液,白色管子以每秒6克的流量流出水。白管打开后开始8秒不流,接着流4秒;然后又停8秒,再流4秒……若将三管同时打开,1分钟后都关上,这时混合液中酒精浓度约为()。

A.15%

B.18%

C.21%

D.24%

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更多“自动消毒剂有红、黄、白三根管子,红色管子以每秒5克的流量流出浓度为20%的酒精溶液,黄色管子以每秒”相关的问题

第1题

Which three statements are true about Oracle Data Pump export and import operations?()

A. You can detach from a data pump export job and reattach later.

B. Data pump uses parallel execution server processes to implement parallel import.

C. Data pump import requires the import file to be in a directory owned by the oracle owner.

D. The master table is the last object to be exported by the data pump.

E. You can detach from a data pump import job and reattach later.

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第2题

You are about to plug a multi-terabyte non-CDB into an existing multitenant container data
base (CDB) as a pluggable database (PDB).The characteristics of the non-CDB are as follows:-Version: Oracle Database 12c Releases 1 64-bit -Character set: WE8ISO8859P15 -National characterset: AL16UTF16 -O/S: Oracle Linux 6 64-bitThe characteristics of the CDB are as follows: -Version: Oracle Database 12c Release 1 64-bit -Characterset: AL32UTF8 -O/S: Oracle Linux 6 64-bitWhich technique should you use to minimize down time while plugging this non-CDB into the CDB?()

A. Transportable database

B. Transportable tablespace

C. Data Pump full export / import

D. The DBMS_PDB package

E. RMAN

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第3题

You are about to plug a multi-terabyte non-CDB into an existing multitenant container data
base (CDB).The characteristics of the non-CDB are as follows:-Version: Oracle Database 11g Release 2 (11.2.0.2.0) 64-bit -Character set: AL32UTF8 -National character set: AL16UTF16 -O/S: Oracle Linux 6 64-bitThe characteristics of the CDB are as follows:-Version: Oracle Database 12c Release 1 64-bit -Character Set: AL32UTF8 -National character set: AL16UTF16 -O/S: Oracle Linux 6 64-bitWhich technique should you use to minimize down time while plugging this non-CDB into the CDB?()

A. Transportable database

B. Transportable tablespace

C. Data Pump full export/import

D. The DBMS_PDB package

E. RMAN

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第4题

You executed the following command:RMAN> RECOVER COPY OF DATAFILE ‘/u01/app/oracle/oradata/orcl/users01.dbf‘;Which statement regarding the above command is correct?()

A. The ‘/u01/app/oracle/oradata/orcl/users01.dbf‘ data file is recovered from the image copy

B. The ‘/u01/app/oracle/oradata/orcl/users01.dbf‘ data file is recovered from the last incremental backup

C. Image copies of the ‘/u01/app/oracle/oradata/orcl/users01.dbf‘ data file are updated with all changes up to incremental backup SCN. ‘/ u01/app/oracle/oradata/orcl/users01.dbf

D. Image copies of the ‘/u01/app/oracle/oradata/orcl/users01.dbf‘ data file are recovered using the above command if data file recovery fails

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第5题

View the Exhibit and examine the Data Pump architecture. Identify the numbered components.()

A. 1 - Oracle Loader, 2 - Oracle Data Pump, 3 - Direct Path API

B. 1 - Oracle Data Pump, 2 - Direct Path API, 3 - Oracle Loader

C. 1 - Direct Path API, 2 - Oracle Loader, 3 - Oracle Data Pump

D. 1 - Oracle Loader, 2 - Direct Path API, 3 - Oracle Data Pump

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第6题

After paying 1000 dollars ______, you'll all become full members of our club.A.bothB.allC.

After paying 1000 dollars ______, you'll all become full members of our club.

A.both

B.all

C.every

D.each

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第7题

In which case would you use a FULL OUTER JOIN? ()

A. Both tables have NULL values.

B. You want all unmatched data from one table.

C. You want all matched data from both tables.

D. You want all unmatched data from both tables.

E. One of the tables has more data than the other.

F. You want all matched and unmatched data from only one table.

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第8题

ABC Corp. is implementing 11i Oracle Applications. The company has two local administrator
s in separate locations. They need to ensure that only a relevant set of users is visible to each of these local administrators.Which action will meet the requirement?()

A.create a separate role for each local administrator

B.specify user administration privileges in Oracle User Management

C.use Data Security to provide relevant access to each local administrator

D.use Function Security to provide relevant access to each local administrator

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第9题

After paying 1 O00 dollars ______ , you'll all become full members of our club.A.bothB.all

After paying 1 O00 dollars ______ , you'll all become full members of our club.

A.both

B.all

C.every

D.each

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第10题

You installed Oracle Database 11g and are performing a manual upgrade of the Oracle9i data
base. As a part of the upgrade process, you execute the following script:SQL>@utlu111i.sqlWhich statement about the execution of this script is true?()

A. It must be executed from the Oracle Database 11g environment.

B. It must be executed only after the SYSAUX tablespace has been created.

C. It must be executed from the environment of the database that is being upgraded.

D. It must be executed only after AUTOEXTEND is set to ON for all existing tablespaces.

E. It must be executed from both the Oracle Database 11g and Oracle Database 9i environments.

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