... three position signal 三位式号志 three position system 三位制 three quarters bat 四分三长砖 ...
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“三位制”教学模式的探索实践旨在为技工学校的教育教学提供借鉴和参考。
" three oake " the exploration practice of teaching mode aim at offering reference and consulting for the education teaching of the technical school ".
针对目前全球丙烯及其衍生物需求量不断增长的趋势，丙烷脱氢制丙烯已成为第三位的丙烯来源。
The production of propylene by propane dehydrogenation has become the third source of propylene to meet the continuously increasing demand of propylene and its derivatives in the world.
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