题目内容

目前在汽车修补涂装中广泛使用的腻子是()

A. 酚醛腻子
B. 环氧腻子
C. 油性腻子
D. 聚酯腻子

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简述秒延期电雷管。

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

简述整群随机取样法的优点与不足。

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