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分光双星

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电梯导轨的作用是用来支承电梯轿厢和对重的重量.（）

A. 正确
B. 错误

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GAAS80/700焊机的液压伺服阀是带有（）的高精度控制阀。

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You have the following requirements in relation to the detection of block corruption for your database instance: 1. Check for logical self-consistency of data blocks when modified in memory. 2. Checksums are calculated before and after the block change. 3. Checks are performed for the lost writes to the physical standby database. Which method would help you perform the above checks automatically? （）

A. Set the DB_SECUREFILE parameter to PERMITTED
B. Set the DB_ULTRA_SAFE parameter to DATA_ONLY
C. Set the DB_LOCK_CHECKSUM parameter to TYPICAL
D. Set the DB_LOST_WRITE_PROTECT parameter to TYPICAL

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土地受容力

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