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（）的名称，最早见于上古史籍《尚书・禹贡》：“淮、海惟扬州”。

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集团军编有防空兵旅或高炮旅，防空兵旅下辖（）、（）；每个地空导弹营辖高炮连。

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当发现蓄电池电解液液面过低时，只能加注蒸馏水，不能加注硫酸溶液，不然会使电解液密度偏高，降低蓄电池的使用寿命。

A. 正确
B. 错误

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Consider the following scenario for your database: - Backup optimization is enabled in RMAN. - The recovery window is set to 7 days in RMAN. - The most recent backup to disk for the TOOLS tablespace was taken on November 3, 2007. - The TOOLS tablespace is read-only since November 4, 2007. On November 23, 2007, you issue the RMAN command to back up the database to disk. Which statement is true regarding the backup of the TOOLS tablespace?（）

A. The RMAN backup fails because the TOOLS tablespace is read-only
B. The RMAN skips the backup of the tablespace because backup optimization is enabled
C. The RMAN makes backup because optimization can be enabled only for backups to disk
D. The RMAN makes the backup because no backup of the tablespace exists within the seven day window

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船舶起货机对拖动电动机有哪些基本要求？

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