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连接管线时，发现垫圈坏了，是应该立即更换还是下次再换？

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配制一般试液，可选择什么样的化学试剂？配制滴定液，应选择什么样的化学试剂？

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ADA法脱硫吸收液是在（）溶液中增加等比例2.6和2.7—捺醌二磺酸的钠溶液配置而成。

A. NaoH
B. Na₂Co₃
CaCO₃
D. （N₂SO₄

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“海水西调”设想提出后遭多方争议，试从地质、水文、土壤等方面分析质疑理由。

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Your are the DBA supporting an Oracle 11g Release 2 database and wish to move a table containing several DATE, CHAR, VARCHAR2, and NUMBER data types, and the table’s indexes, to another tablespace. The table does not have a primary key and is used by an OLTP application. Which technique will move the table and indexes while maintaining the highest level of availability to the application?（）

A. Oracle Data Pump.
B. An ALTER TABLE MOVE to move the table and ALTER INDEX REBUILD to move the indexes.
C. An ALTER TABLE MOVE to move the table and ALTER INDEX REBUILD ONLINE to move the indexes.
D. Online Table Redefinition.
Edition-Based Table Redefinition.

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