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特高压±1100千伏直流输电距离可以达到（）公里，输送容量可达1200万千瓦，世界各大清洁能源基地与负荷中心都在特高压输送范围内。

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Tape streaming is not happening while performing RMAN tape backup. On investigation， you find that it is not because of the incremental backup or the empty file backup and that RMAN is sending data blocks to the tape drive fast enough. What could be a solution to make tape streaming happen during the backup？（）

A. Configure backup optimization
B. Configure the channel to increase MAXOPENFILES
Configure the channel to increase the capacity with the RATE parameter
D. Configure the channel to adjust the tape buffer size with the BLKSIZE optio

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（）不是甲醇中脱除的酸性气体。

A. H₂S
B. NH₃
C. HCOOH
D. CH₄

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变压器原副边的电压和电流之间有什么关系？

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根据果蔬种类的不同，可以将干制品分类为（）、脱水菜或干菜。

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