论文部分内容阅读
Russiapossessesexclusivelylimited (about 5%ofthetotalworldamount) petroleumresources,butithasconsiderablylargersuppliesofnaturalgas
Russiapossessesexclusivelylimited (about 5% ofthetotalworldamount) petroleumresources, butithasconsiderablylargersuppliesofnaturalgas