在国际贸易中，常用的度量衡制度有（）。 ["公制","英制","美制","国际单位制"]
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 have a server that runs Windows Server 2003 Service Pack 2 (SP2). You back up the files on the server by using the following schedule: ·Full backup every Sunday ·Differential backup at 01:00 every Monday to Friday You want to restore the version of a file stored on the server at the start of the business day on Wednesday. You are unsure when the file was last modified. You need to restore the appropriate version of the file by using the minimum number of tapes. Which backup jobs should you review to locate the correct version of the file? （） [" the differential backup from Tuesday"," the differential backup from Wednesday and then the full backup from Sunday"," the full backup from Sunday"," the full backup from Sunday and then all other backu"]
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"]
血浆蛋白是多种蛋白的总称，包括（）三种。
