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简述秒延期电雷管。

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人造石材究竟分为几种？其各自特点是什么？

Examine the following scenario： The target database instance is running. The most recent backup available for the target database was taken two days ago. Log files switches have occurred in last two days. The target database is duplicated on the same host， using the Recovery Manager （RMAN） duplicate command as follows： RMAN> RUN { ALLOCATE AUXILIARY CHANNEL aux 1 DEVICE TYPE DISK； DUPLICATE TARGET DATABASE TO auxdb； } Which statement is true about the duplicate database in this scenario？（）

A. It contains data till the last backup
B. It contains all data from target database until the current time
C. It contains all data from only the committed transactions in the target database
D. It contains all data except that which is used by the transactions in the current online redo file of target database

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简述整群随机取样法的优点与不足。

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强化文明创建活动，对（）企业精神及时总结、提炼、升华。健全完善党委统一领导、党政工团齐抓共管、有关部门积极参与的文明创建工作机制。

A. “团结奉献、求实进取”
B. “团结紧张、求实进取”
C. “团结奉献、务实进取”
D. “积极奉献、求实进取&rdquo

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