下列各类炉型中,设计生产设计生产能力最大的是()。
A. SRT-Ⅲ
B. SRT-Ⅵ
C. USC
D. GK-Ⅵ
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Which two statements are true about checkpointing()
A. The checkpoint frequency decreases with the smaller redo log file size.
B. It ensures that all committed data is written to the data files during normal shutdown.
C. The frequent full checkpoint in a database can cause the overall degradation of the database performance.
D. It prompts the Checkpoint (CKPT) process to write data to the data files and redo information to the online redo log files.
经纬仪测定两点间的水平距离,其相对误差为()。
A. 1/100~1/200
B. 1/200~1/300
C. 1/300~1/400
D. 1/400~1/500
测量中,受到人的感觉器官限制形成的误差,称为()。
A. 系统误差
B. 偶然误差
C. 粗差
D. 多余误差
在标准大气压状态下,瓦斯爆炸的瓦斯浓度范围为()。
A. 1%~10%
B. 5%~16%
C. 3%~10%