因此,必须选择适当的馏分油,用调合法使它满足市场的要求.And optimum selection of crude types to meet market requirements by blending is necessary.C5馏分油主要来源于石油烃高温裂解制乙烯过程的副产品,随着乙烯工业的发展,乙烯废弃的C5馏分量逐年增大.另一方面,民用燃料需要量颇为可观.C 5 distillate of ethylene access...
Right now we are in the changeover period between autumn and winter.眼下，我们正处于秋冬交替的时候。He again called for a faster changeover to a market economy...他再次呼吁加快向市场经济过渡。At what is changeover enzymatic depressor basically used si...