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经产母猪要选择“前精后粗”的饲养方式；初产母猪、在哺乳期参加配种的母猪要选择“（）”的饲养方式。

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Your network contains an Active Directory domain. The domain contains two domain controllers named DC1 and DC2. You perform a full backup of the domain controllers every night by using Windows Server Backup. You update a script in the SYSVOL folder. You discover that the new script fails to run properly. You need to restore the previous version of the script in the SYSVOL folder. The solution must minimize the amount of time required to restore the script. What should you do first（）

A. Run the Restore-ADObject cmdlet.
B. Restore the system state to its original location.
C. Restore the system state to an alternate location.
D. Attach the VHD file created by Windows Server Backup.

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风机的主要工作参数为流量、风压、转速和功率

A. 正确
B. 错误

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铸造生产特别适合于制造受力较大或受力复杂零件的毛坯。

A. 正确
B. 错误

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氧转移效率与水温无关

A. 正确
B. 错误

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