在抗日民族统一战线中，争取中间势力，就是争取（）。 ["民族资产阶级、开明绅士和地方实力派","城市小资产阶级和流氓无产阶级","贫农、中农和富农阶级","地主阶级和各地军阀"]
（）主持召开企业定期的安全生产工作会议，研究本企业安全生产工作，作出相应决策，组织实施。 ["企业第一领导者","总工程师","主管安全工作的副厂长","专职机构的正职领导"]
关于关于重组PCR定点突变法叙述正确的是（） ["增加镁离子浓度容易产生正向突变","第一轮PCR扩增的是不同DNA模版链","第二轮PCR扩增的是同一DNA模板链","第三轮PCR需要两种外侧寡核苷酸引物进行扩增","该方法产生的DNA片段需要经过测序来验证是否发生其他突变"]
ou work in a company which uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance. According to the company requirement, you intend to perform an installation of an instance of SQL Server Reporting Services (SSRS) to the same machine. Now your company CIO wants version histories of all deployed reports can be kept. As a technical support, what should you do to ensure this?（） ["You should use the http.sys listener to install the SSRS instance. ","You should configure the SSRS database, make it use Native mode ","You should configure the SSRS database, make it use SharePoint integrated mode ","You should use the Internet Information Services default Web site to install the SSRS instance&e"]
什么是矿产资源？
医疗器械是指（）或者（）使用于人体的仪器、（）、（）或者其他物品，包括所需的（）。
