Through PLC control, the glass processing data can be set on the interface. It can perform one-passoperation of coarse and fine grinding and polishing in precise, stable and reliable way.
采用PLC控制电流通过界面设定玻璃加公数据,具有粗精磨抛光一次完成,准确、稳定可靠。
2
If more than one column is aggregated using the same grouping key or without a grouping key, then all the aggregations are computed within the same operation with a single pass over the data.