单词	null algebra
释义	null algebra 零代数
随便看	delete rule deletery deletes delete safely Deletes a packet filter to the list of filters Deletes a persistent static route Deletes a virtual server record delete schematic view delete search Delete segment delete segment function delete selected virus log files delete sentry Delete Sentry control file not found delete server file delete share delete sheet Deletes only the current record delete spline delete spline modifier Deletes preference for a specified protocol delete statemant delete statement Deletes the current site link Deletes the selected relation object