【简答题】已知考生目录文件夹含有数据表XS.DBF,要求: 1) 将数据表XS.DBF按“流水号”的升序建立非结构复合索引,索引表达式“流水号”,索引标识“lsh”,索引文件名“lshsy”。 2) 在数据表XS.DBF中按照 “ 购物平台 ” 升序对 “ 金额 ” 进行分类汇总,并将其结果保存到表HZ.DBF中。 3)统计购物平台是“淘宝”的记录数,保存到变量tb中,并将变量tb保存到文件s1.mem中。
【单选题】按岩石的形成方式分类,天然大理石属于 ( )
【单选题】Some countries are increasing their use of natural gas, and other forms of ______.
【单选题】按岩石的形成方式分类.天然大理石属于( )
【简答题】The oldest forms of transportation in America are still in use, and especially boats on America's rivers and
【单选题】Some countries are increasing their use of natural gas, and other forms of __________.
【单选题】Many co untries are increasing their use of natural gas, wind and other forms of ________. [ ]