总计查询计算多组记录的小计。
A totals query calculates subtotals across groups of records.
一种信息记录介质，具有多种或多组伺服信息，这些伺服信息被记录为磁信息并被用于检测相对于磁头的相对位置。
An information recording medium having a plurality of kinds of sets of servo information recorded as magnetic information for detecting the relative position with respect to a magnetic head.
应用推荐