However, distant river field also is facing the dilemma with degressive resource.然而, 辽河油田也面临着资源递减的困境.Resource increasing cost of degressive, exploitation, this is the objective law that resource city avoids hard.资源递减 、 开...
航空航天系列.飞行器用电缆.试验方法. 第508部分: 电镀板厚度.Aerospace series - Cables electrical , aircraft use - Test methods - Part 508: plating thickness.用电缆直接向接受器传输信号的电视.A communications cable as one used to transmit telephone or telegraph si...