给颈部损伤的乘客开通气道时,应该采取以下哪种方法()
A. 双手拉颌法
B. 仰头抬颈法
C. 仰头抬颌法
D. 双手抬颌法
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A programmer wants to generate values for a numeric ID column in their EXPENSE table. The ID column values need to be incremented by 1000 for each new expense report added to the EXPENSE table. Which DB2 object can be referenced by an INSERT statement to meet thisrequirement?()
A. Sequence
B. Table Function
C. Identity Column
D. INSTEAD OF Trigger
甲烷化过程由于要消耗()。其进口气体中CO和CO2含量必须小于或等于()。
burbackup命令是系统备份复制命令,把APG的K:images中的系统备份文件备份到D盘
A. 正确
B. 错误
在轿厢顶上作业需起动轿厢前,应紧握轿顶上曳引绳,以保持身体的稳定。()
A. 正确
B. 错误