有一振动式给煤机煤槽磨出了孔洞,应该用贴补法焊补,不过焊口处应平整光滑,无凹凸现象。
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某基础宽为2.0m,基础顶面柱脚宽1.0m;基础台阶的宽高比为1:2.00,该基础高度不应小于()。
A. 0.5m
B. 1.0m
C. 1.5m
D. 2.0m
视频处理放大器主要有视频处理放大单元,同步再生发生器和色同步控制振荡器三大部分组成。
A. 正确
B. 错误
治疗伴有消化性溃疡的高血压药物首选的药物是()。治疗心绞痛急性发作的首选药物是()。
A. 硝酸甘油
B. 可乐定
C. 硝苯地平
D. 卡托普利
E. 维拉帕米
What are the two advantages of RMAN Block Media Recovery (BMR) over file-level recovery?()
A. BMR lowers the mean time to recover (MTTR).
BMR supports point-in-time recovery of individual data blocks.
C. BMR enables you to use incremental backups for block recovery.
D. BMR enables recovery even when the database is not mounted or open.
E. BMR enables you to use proxy backups to perform block media recovery.
F. BMR enables increased availability of data during recovery because the data file requires a recovery can remain online.