They were given only rudimentary training in the job.他们仅仅受到过基本的职业训练。He has only a rudimentary knowledge of the subject.他对这一科只有初步的认识.I have only a rudimentary knowledge of chemistry.我只有些粗浅的化学知识....
In humans, the pars intermedia is a rudimentary region.人的脑垂体中间部是不发达的.They were given only rudimentary training in the job.他们仅仅受到过基本的职业训练。I have only a rudimentary knowledge of chemistry.我只有些粗浅的化学知识....a kind of rudimenta...
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...