Which two statements are true about standard database auditing（）
A. DDL statements can be audited.
B. Statements that refer to stand-alone procedure can be audited.
C. Operations by the users logged on as SYSDBA cannot be audited.
D. Only one audit record is ever created for a session per audited statement even though it is executedmore than once.
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队旗旗杆的高度，苏州市统一标准是大队旗（）米，中队旗（）米
硫化氢气体是仅次于（）的剧毒、容易致人死亡的神经性有毒气体。
The amount of chloride content in the water of an auxiliary boiler can be reduced by（）
A. adding hydrazine
B. blowing down the boiler
C. adding phenolphthalein
D. adding a sulfite chloride scavenger
社会保险费征收机构可以直接划拨欠费单位的银行存款，用于抵缴社会保险费。
A. 正确
B. 错误
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