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煤巷、煤一岩巷和岩石巷道是怎样划分的？

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会计凭证分为原始凭证和记账凭证的依据是()。

A. 填制方式
B. 反映业务的方法
C. 填制程序和用途
D. 取得来源

You want to perform an RMAN backup of database as a copy. Which two factors will you consider while performing the backup operation?（）

A. The backup as copy can only be taken to disk
B. The backup as copy can only be taken to tape
C. Backup can be performed only when the instance is shutdown
D. Backup will constitute all used and unused blocks in the database

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简述毒物和中毒的概念。

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GB175-2008中，水泥密度的单位是kg/m³。

A. 正确
B. 错误

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煤巷、煤一岩巷和岩石巷道是怎样划分的？

会计凭证分为原始凭证和记账凭证的依据是()。

You want to perform an RMAN backup of database as a copy. Which two factors will you consider while performing the backup operation?（）

简述毒物和中毒的概念。

GB175-2008中，水泥密度的单位是kg/m3。

GB175-2008中，水泥密度的单位是kg/m³。