防止药物毒性反应的主要措施有哪些？

某学生在学习“gas-煤气”这一单词时加入中介词，将其加工成“gas－该死—煤气”。该学生所使用的策略是（）。

A、精细加工策略

B、组织策略

C、复述策略

D、计划监控策略

每（）应用酒精清洗打印头前端，以免污垢充塞打印头导板针孔。(五级、四级)

A、一个月

B、二个月

C、三个月

D、四个月

A DBA has been asked to create a table which will contain a substantial amount of detailed sales information for each calendar month and maintain it to contain only the last 12 months. Which of the following methods will facilitate the online removal of the oldest month’s data?（）

A、Create an MQT that selects the oldest month of data with the REFRESH IMMEDIATE option.

B、Create 12 separate tables, create a view based on all 12, drop the table with the oldest month's data then drop and re- create the view.

C、Create a range partitioned table, partitioned by month, and use the ALTER TABLE statement to detach the oldest month and attach storage for new data.

D、Create a single table, extract the data to be retained using UNLOAD with a SELECT statement, drop and re-create the table then load only the data to be retained.

隔离网闸采用的是物理隔离技术。

A、对

B、错

以下哪个存档方式只会备份自上一次完整备份起发生更改的数据？（）

A、快照

B、增量

C、复制

D、差异