测量工具可测量工作区域内任意两点之间的距离。当在两点间测量时，将产生一条（） [" 非打印线条"," 可打印线条"," 可视线条"," 可隐藏线条"]
酶定向进化是在体外进行酶基因的（），然后在人工控制条件的特殊环境下进行（），而得到具有优良催化特性的酶的突变体。
You are an IIS Web server administrator implementing authentication settings for a new Web site.According to the requirements for the Human Resources Web site， users should be prompted forauthentication information when they attempt to access the site. The site will be accessed only by userswho have accounts in your organization’s Active Directory domain. You have already configured the filesystem permissions for the content based on the appropriate settings. You also want to maximize securityof the site. Which two actions should you take to meet these requirements？（） ["Enable Windows authentication.","Enable basic authentication.","Disable anonymous authentication.","Enable anonymous authentication."]
在测算人、料、机消耗量时，若为编制招标控制价则一般参照的定额为（） ["消耗量定额","施工定额","企业定额","预算定额"]
成功与失败相互依存相互对立而存在的，在一定条件下可以相互转化。
DNA指纹有何特点？
