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串联布置的弹簧系统的总柔度等于各弹簧柔度的代数和。()

A. 正确
B. 错误

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下列哪种是根据溶解度不同而进行各种蛋白质分离纯化的()

A. 吸附层析
B. 超滤
C. 电泳
D. 离子交换层析
E. 亲和层析

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《建筑设计防火规范》规定，建筑物的耐火极限分为()级。

A. 甲
B. 乙
C. 三
D. 四

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用于电容器组的放电器的放电性能应满足电容器组脱开电源后，在5s内将电容器组上的剩余电压降至（）及以下。

A. 100V
B. 80V
C. 60V
D. 50V

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You work in a company which is named Wiikigo Corp. The company uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance. There is a database named DB1 in the instance. On DB1, quite few logged operations are performed. Now according to the requirement of the company CIO, you must validate that the database can be restored to a specific point in time. So what action should you perform to achieve this goal? （）

A. You should verify that the simple recovery model is used by the database.
B. You should verify that the full recovery model is used by the database.
C. You should verify that the checksum page verify option is used by the database.
D. You should verify that the bulk-logged recovery model is used by the database.&e

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串联布置的弹簧系统的总柔度等于各弹簧柔度的代数和。()

A. 正确 B. 错误

下列哪种是根据溶解度不同而进行各种蛋白质分离纯化的()

《建筑设计防火规范》规定，建筑物的耐火极限分为()级。

用于电容器组的放电器的放电性能应满足电容器组脱开电源后，在5s内将电容器组上的剩余电压降至（）及以下。

A. 正确
B. 错误