If the input air quality is poor, can cause electromagnetic valve, the valve coreoil pollution within the open mouth can't completely, the difficult open.
如果输入空气质量差,会造成电磁阀内产生油污,阀芯开启困难,阀口不能完全打开。
2
RDFS is still the simplest and most pervasive choice, but DAML + OIL has many things to recommend it: not just the additional features, but the cleaner core semantics as well.