目的酶基因的DNA区段一侧含有一酶切位点，可用什么方法对酶分子进行改造（） ["寡核苷酸引物突变法","盒式突变","PCR定点突变法","大引物突变法","E易错PCR法"]
医疗器械根据结构特征的不同，分为（）和（）。根就是否接触人体，分为（）和（）。
安全生产责任制要求（）对本企业安全生产负具体领导责任。 ["企业第一领导者厂长（经理）","总工程师","主管安全工作的副厂长","专职机构的正职领导"]
You work in a company which uses SQL Server 2008. You are the administrator of the company database. In your company there is a server which contains a default SQL Server 2005 instance. For a new application, you have to install a SQL Server 2008 instance on the server. Your company CIO assigns a task to you. You must make sure that the respective certified third-party applications have access to both database instances. You have to achieve this goal without changing the existing application environments. So what should you do to achieve this by using as little database administrative effort as possible?（） ["You should install SQL Server 2008 as a named instance, and make the new application to use the new instance. ","You should install SQL Server 2008 as the default instance, and make the new application to use the default instance. ","You should upgrade the SQL Server 2005 application to use SQL Server 2008. ","You should upgrade the SQL Server 2005 instance to a SQL Server 2008 instance.&e"]
进行穿斗式和抬梁式木构架优缺点的比较。
16PF
