three links
2.The results show that with the increase of pyrolysis pressure,the light weight fractions of tar increase,specifically the BTX and PCX increase observably,either in N_2 or in H_2,thereby the property of tar was modified,the mean molecular weight of tar decrease,the molecular composition in the tar is mainly mono-di-aromatics,and the most long-chain of the aromatic side link has three links.
9.As the Taiwan compatriots are more vocal in their demand for peace, tranquility and development, cross-Straits economic, trade, cultural and personnel exchanges have become more frequent, and the opening of three direct links in mail, air and shipping, and trade between the two sides represents the popular will and the trend of the times.

